Edward John O'Brien (1968), Musician; guitarist for Radiohead. 1 portrait.
Michael O'Brien (1937-1968), Accountant; son of Robert Alfred O'Brien. 3 portraits.
Miriam O'Reilly (1957-), Television presenter. 1 portrait.
Della Oake, Fashion model. 1 portrait.
Sir Charles Oakeley, 1st Bt (1751-1826), Administrator in India. 1 portrait.
Sir Charles John Oakeley, 5th Bt (1862-1938), Justice of the Peace. 7 portraits.
Sir Charles Richard Andrew Oakeley, 6th Bt (1900-1959), Head of Oakeley, Vaughan and Co.. 10 portraits.
Lady Helena Oakeley (née Beatson) (died 1839), Artist; wife of Sir Charles Oakeley, Bt. 4 portraits.
Sir Herbert Stanley Oakeley (1830-1903), Composer. 3 portraits.
Marina (Bessel), Lady Oakeley, Second wife of Sir Oakeley, 6th Bt. 10 portraits.
Sir Cecil Oakes (1884-1959), Alderman. 3 portraits.
Sir Hildebrand Oakes (1754-1822), Lieutenant-General. 5 portraits.
Philip Barlow Oakes (1928-2005), Scriptwriter, broadcaster, film critic and poet. 1 portrait.
Richard Oakes (active 19th century), Provost of King's College, Cambridge. 1 portrait.
Mrs Oakes. 1 portrait.
Sir Walter Fraser Oakeshott (1903-1987), Vice-Chancellor of Oxford University. 1 portrait.
Philip Oakey (1955-), Musician; co-founder, composer and lead singer for The Human League. 1 portrait.
Alfred James Oakley (1880-1959), Sculptor. 4 portraits.
Henry John Percy Oakley (1878-1942), Actuary. 1 portrait.
Kenneth Page Oakley (1911-1981), Anthropologist, palaeontologist and museum curator. 1 portrait.
Octavius Oakley (1800-1867), Watercolourist. 2 portraits.
Sylvia Oakley, Actress. 7 portraits.
Thomas Oakley (1879-1936), MP. 3 portraits.
Hendrie Dudley Oakshott, Baron Oakshott of Bebington (1904-1975), Politician. 5 portraits.
Richard Oastler (1789-1861), Reformer. 3 portraits.
Lawrence Edward Grace Oates (1880-1912), Antarctic explorer. 3 portraits.
Mark Oates (active 1799), Captain in the Royal Marines. 1 portrait.
Simon Oates, Actor. 1 portrait.
Titus Oates (1649-1705), Informer. 23 portraits.
Verity Oates, Suffragette. 2 portraits.
Alastair Oatey, Personnel Assistant, National Portrait Gallery. 1 portrait.
Charles William Oatley (1904-1996), Professor of Electrical Engineering. 1 portrait.
Third Mate Oba, Third Officer of the Japanese ship Taisei Maru. 1 portrait.
Charles Obach (1841-1921), Art dealer; Founder of Obach & Co.. 1 portrait.
Robert Obbard (active 1844), Member of a deputation to Louis Philippe, 1844. 1 portrait.
Thomas Lewis O'Beirne (1748-1823), Bishop of Meath. 1 portrait.
Merle Oberon (Estelle Merle O'Brien Thompson) (1917-1979), Film actress. 24 portraits.
Yolanda, Viscountess Obert de Thieusies, Daughter of Baron Romano-Auezzana; wife of Vicomte Obert de Thieusies. 6 portraits.
Fiona Jane Obert de Thieusies (née O'Brien) (1941-), Wife of Romano Louis Marie Joseph Ghislain Obert de Thieusies; daughter of Hon. Fionn Myles Maryons O'Brien. 3 portraits.
Sergey Vladimirovich Obraztsov (1901-1992), Puppet master. 3 portraits.
Graeme Obree (1965-), Cyclist. 2 portraits.
Patrick O'Brian (Richard Patrick Russ) (1914-2000), Novelist. 1 portrait.
Alice O'Brien, Actress. 6 portraits.
Arthur John Rushton O'Brien (1883-1940), Chief Medical Adviser to Secretary of State for Colonies. 1 portrait.
Hon. (Katharine) Beryl O'Brien (born 1898), Eldest daughter of 15th Baron Inchiquin; wife of John Francis Patrick Gallagher. 3 portraits.
Brian O'Brien (died 1973), Solicitor. 1 portrait.
Dermod O'Brien (1865-1945), Artist. 1 portrait.
Edmund Donough John O'Brien (1858-1945), Brigadier-General. 1 portrait.
Edna O'Brien (circa 1932-), Novelist, short story writer and playwright. 7 portraits.
Edward Joseph Harrington O'Brien (1890-1941), Editor and anthologist. 2 portraits.
Hon. Eileen Vivien O'Brien (née de la Poer Beresford) (1912-1975), Wife of Robert Alfred O'Brien; daughter of 5th Baron Decies. 9 portraits.
Eliza Bridgeman O'Brien (née Willyams) (died 1802), Wife of James O'Brien, later 3rd Marquess of Thomond. 1 portrait.
Fiona Jane O'Brien (1941-), Wife of Romano de Thieusies. 1 portrait.
Hon. Fionn Myles Maryons O'Brien (1903-1977), Third son of 15th Baron Inchiquin. 1 portrait.
Griselda Etheldreda Clodagh O'Brien. 1 portrait.
Jack O'Brien. 1 portrait.
James (Bronterre) O'Brien (1805-1864), Chartist. 1 portrait.
James Francis Xavier O'Brien (1828-1905), Irish nationalist. 2 portraits.
Josephine Reine O'Brien (née Bembaron) (1913-), Wife of Hon. Fionn Myles Maryons O'Brien; daughter of Joseph Eugene Bembaron. 2 portraits.
Kate O'Brien (1897-1974), Novelist. 16 portraits.
Kendal Edmund O'Brien (1849-1909), Politician and farmer. 1 portrait.
Michael O'Brien (1954-), Politician. 5 portraits.
Nelly O'Brien (died 1768), Courtesan. 11 portraits.
Patrick O'Brien (1853-1917), Mechanical and marine engineer and politician. 4 portraits.
Patrick Joseph O'Brien (1835-1911), Politician, hotel proprietor, property and land owner. 4 portraits.
Richard O'Brien (1942-), Creator of 'The Rocky Horror Picture Show', actor and television presenter. 1 portrait.
Sean O'Brien (1952-), Poet. 1 portrait.
Lady Susanna Sarah Louisa O'Brien (née Fox-Strangways) (1743-1827), Actor; wife of William O'Brien. 1 portrait.
Sir Tom O'Brien (1900-1970), Labour MP. 6 portraits.
William O'Brien (1738?-1815), Actor. 4 portraits.
William O'Brien (1852-1928), Irish nationalist leader and journalist. 5 portraits.
Sir William Donough O'Brien (1916-), Admiral. 6 portraits.
William Smith O'Brien (1803-1864), Irish nationalist. 1 portrait.
Hermann Obrist (1862-1927), Sculptor. 1 portrait.
Edward O'Bryen (1753 or before-1808), Naval officer. 3 portraits.
Sir Desmond Dykes Tynte O'Callaghan (1843-1931), Major-General. 6 portraits.
Richard O'Callaghan (1940-), Actor. 1 portrait.
Hon. William Frederick Ormonde O'Callaghan (1852-1877), Politician; son of 2nd Viscount Lismore. 1 portrait.
Sean O'Casey (1880-1964), Playwright and writer. 5 portraits.
Giuseppe Paolo Stanislao Occhialini (1907-1993), Italian physicist. 1 portrait.
Samson Occom (1723?-1792), Missionary to North American Indians. 1 portrait.
Humphrey Ocean (Humphrey Anthony Erdeswick Butler-Bowdon) (1951-), Painter. 2 portraits.
Mrs T. Ochiai. 1 portrait.
Sir David Ochterlony, 1st Bt (1758-1825), General. 2 portraits.
William Ockham (circa 1287-1347), Philosopher, theologian, and political theorist. 1 portrait.
Ron Ockindon, Photographer. 1 portrait.
Daniel O'Connell (1775-1847), Irish politician. 83 portraits.
J.C. O'Connell. 1 portrait.
Louisa Catherine Clare O'Connell (née Leighton) (died 1928), Wife of Maurice Charles O'Connell. 1 portrait.
Arthur O'Connor (1763-1852), Irish rebel. 7 portraits.
Arthur O'Connor (1844-1923), Politician and judge. 4 portraits.
Sir Denis Stuart Scott O'Connor (1907-1988), Lieutenant-General. 1 portrait.
Dennis O'Connor (1794-1847), MP for County Roscommon. 1 portrait.
Des O'Connor (1932-), Entertainer. 1 portrait.
Erin O'Connor (1978-), Fashion model. 2 portraits.
Feargus Edward O'Connor (1796?-1855), Chartist leader. 4 portraits.
Frank O'Connor (Michael Francis Xavier O'Donovan) (1903-1966), Writer. 2 portraits.
Sir (William) Frederick Travers O'Connor (1870-1943), Lieutenant-Colonel. 1 portrait.
Jack O'Connor (1897-1977), Cricketer. 2 portraits.
James O'Connor (1836-1910), Journalist and politician. 2 portraits.
John O'Connor (1850-1928), Politician. 13 portraits.
Sir Richard Nugent O'Connor (1889-1981), General. 1 portrait.
Roger O'Connor (1762-1834), Irish nationalist. 3 portraits.
Sinead O'Connor (1966-), Singer, songwriter and actress. 2 portraits.
Thomas Power O'Connor (1848-1929), Journalist and politician. 19 portraits.
Charles Owen O'Conor (1838-1906), 'The O'Conor Don'; Landlord in Ireland and politician. 2 portraits.
Owen Phelim O'Conor (1870-1943), 'The O'Conor Don'. 1 portrait.
Prince Octavius (1779-1783), Son of George III. 3 portraits.
Prudence Anne ('Prue') O'Day (1946-), Contemporary art dealer. 1 portrait.
E.M. Oddie (née Elinor Mary O'Donoghue), Novelist. 1 portrait.
Henry Hoyle Oddie (1744-1830), Solicitor. 1 portrait.
Dick O'Dell, Record producer. 1 portrait.
Francesca Odell, Archive and Library Assistant, National Portrait Gallery. 1 portrait.
Noel Ewart Odell (1890-1987), Geologist and mountaineer. 4 portraits.
Michel Odent (1930-), Obstetrician and writer. 1 portrait.
Princess Dora Odescalchi, Daughter and heiress of Henry Labonchere; wife of Prince Gialma Odescalchi. 5 portraits.
George William Odey (1900-1985), Politician and businessman. 10 portraits.
George Odger (1813-1877), Shoemaker and trade unionist. 2 portraits.
Joyce Odiase (née Taylor), Student of the Royal Academy of Music; Model. 2 portraits.
Doris Maude Odlum (1890-1985), Psychiatrist. 1 portrait.
Philip O'Doherty (1871-1926), Politician and solicitor. 1 portrait.
Cristina Odone (1960-), Deputy editor of the New Statesman. 1 portrait.
Elliott O'Donnell (1872-1965), Writer and lecturer. 8 portraits.
Eric Hugh O'Donnell (1893-1950), Major-General. 8 portraits.
Frank Hugh O'Cahan O'Donnell (born 1844), Journalist and politician. 1 portrait.
Peter O'Donnell (1920-2010), Writer. 1 portrait.
Bernard O'Donoghue (1945-), Poet. 1 portrait.
Daniel O'Donoghue (1833-1889), 'The O'Donoghue of the Glens'; Irish politician. 1 portrait.
Freeman M. O'Donoghue, Author. 1 portrait.
William James O'Donovan (died 1955), Dermatologist. 4 portraits.
Sir James O'Dowd (1829-1903), Lawyer. 1 portrait.
M.J. O'Dowd. 1 portrait.
Darby O'Driscol. 1 portrait.
Florence O'Driscoll (died 1939), Engineer and journalist. 1 portrait.
Eimar Ultan O'Duffy (1893-1935), Irish playwright, novelist and satirist. 1 portrait.
Sir Michael Francis O'Dwyer (1864-1940), Indian administrator. 2 portraits.
Johannes Oecolampadius (1482-1531), German religious reformer. 1 portrait.
Sean O'Faolain (1900-1991), Novelist and biographer. 6 portraits.
Frederico J. O'Farril, Mexican Ambassador to London. 6 portraits.
Richard More O'Ferrall (1797-1880), Governor of Malta. 1 portrait.
Ronald Stanhope More O'Ferrall (1890-1973), Honorary Canon of Derby Cathedral. 1 portrait.
Offa (died 796), King of Mercia. 2 portraits.
Jacques Offenbach (1819-1880), French composer and cellist. 1 portrait.
Martin Offiah (1966-), Rugby League player. 1 portrait.
Sir Frank Keith Officer (1889-1969), Australian ambassador to China and France. 5 portraits.
Chris Ofili (1968-), Artist. 5 portraits.
Liam O'Flaherty (1896-1984), Novelist. 6 portraits.
Mary O'Flaherty, Fashion model. 1 portrait.
(Shirley) Georgina Ogden (née Maclay) (1933-), Wife of Robert David Ogden; granddaughter of 1st Baron Maclay. 1 portrait.
Samuel Ogden (1716-1778), Divine. 2 portraits.
John Andrew Howard Ogdon (1937-1989), Pianist and composer. 6 portraits.
Sir William Gammie Ogg (1891-1979), Agricultural scientist. 5 portraits.
John Ogilby (1600-1676), Publisher and geographer. 8 portraits.
Robert James Leslie Ogilby (1880-1964), Colonel. 1 portrait.
Hon. Albert George Ogilvie (1891-1939), Premier of Tasmania. 2 portraits.
Sir Andrew Muter John Ogilvie (1858-1924), Director of Army Signals. 2 portraits.
Dame Bridget Margaret Ogilvie (1938-), Biologist. 1 portrait.
Sir Frederick Wolff Ogilvie (1893-1949), Economist and vice-chancellor. 2 portraits.
John Ogilvie (1578 or 1579-1615), Jesuit and saint. 1 portrait.
John Ogilvie (1732-1813), Divine, poet and writer. 1 portrait.
Sir John Ogilvie, 9th Bt (1803-1890), Politician. 1 portrait.
Mary Helen, Lady Ogilvie (1900-1990), Principal of St Anne's College, Oxford. 8 portraits.
Sir George Arthur D.Ogilvie-Forbes (1891-1954), Army captain and foreign diplomat. 5 portraits.
Derek Herbert Ogilvie-Grant-Studley-Herbert (died 1960), Husband of Nina, Countess of Seafield. 8 portraits.
Lady Henrietta Louisa Ogilvy (née Fermor) (born 1829), Wife of Thomas Ogilvy; daughter of 4th Earl of Pomfret. 1 portrait.
Sir Angus James Bruce Ogilvy (1928-2004), Council and trustee of the Prince's Trust. 17 portraits.
Sir David (John Wilfrid) Ogilvy, 13th Bt (1914-1992), Landowner and farmer. 10 portraits.
Ian Ogilvy (1943-), Actor and writer. 1 portrait.
James Robert Bruce Ogilvy (1964-), Son of Princess Alexandra, Lady Ogilvy and Sir Angus Ogilvy. 5 portraits.
Sir John Ogilvy, 9th Bt (1803-1890), Politician. 1 portrait.
Julia Caroline Ogilvy (née Rawlinson) (1964-), Wife of James Robert Bruce Ogilvy; daughter of Charles Frederick Melville Rawlinson. 1 portrait.
Marina Victoria Alexandra Ogilvy (Mrs Paul Mowatt) (1966-), Wife of Paul Julian Mowatt; daughter of Princess Alexandra, Lady Ogilvy and Sir Angus Ogilvy. 4 portraits.
Skene Ogilvy (active late 18th-early 19th century), Minister. 2 portraits.
Thomas Wedderburn Ogilvy (1814-1899), Army officer and landowner. 1 portrait.
Lieutenant-Colonel Ogilvy (died 1801), Soldier; killed at the Battle of Alexandria. 2 portraits.
Miss Ogilvy (active mid 19th century). 2 portraits.
Sir John Oglander (1585-1655), Diarist. 2 portraits.
Catherine Hannah Ogle (active late 18th-mid 19th century), Wife of John Saville Ogle. 1 portrait.
Sir Chaloner Ogle (1681?-1750), Admiral of the Fleet. 2 portraits.
Chaloner Blake Ogle (circa 1765-1857). 1 portrait.
Sir John Ogle (1569-1640), Army officer. 3 portraits.
John Ogle (circa 1652 or 1653-circa 1692), Wit and Gambler. 1 portrait.
Thomas Ogle (active 1801), Swindler. 1 portrait.
Captain Ogle, Naval officer. 1 portrait.
James Edward Oglethorpe (1696-1785), Founder of Georgia. 4 portraits.
David Rees Rees-Williams, 1st Baron Ogmore of Bridgend (1903-1976), Solicitor, politician and civil servant. 23 portraits.
Mrs O'Gorman. 1 portrait.
Gerald Vigors de Courcy O'Grady, The O'Grady (1912-), Lieutenant-Colonel. 4 portraits.
Paul O'Grady (1955-), Comedian. 4 portraits.
Hon. Thomas O'Grady (died 1882), Army officer; son of 1st Viscount Guillamore. 1 portrait.
Alexander George Ogston (1911-1996), Biochemist. 1 portrait.
Thomas O'Hagan, 1st Baron O'Hagan (1812-1885), Judge and politician. 3 portraits.
Maurice Herbert Towneley-O'Hagan, 3rd Baron O'Hagan (1882-1961), Lord-in-Waiting to King Edward VII 1907-10. 2 portraits.
Tamara (née Imeretinsky), Lady Strachey (1926-), Former wife of Thomas Mervyn Smith-Dorrien-Smith and wife of 4th Baron O'Hagan; daughter of Prince Michael Imeretinsky. 3 portraits.
Armen Ohanian (née Sophia Pirboudaghian) (1887-1976), Armenian dancer. 1 portrait.
Brian O'Hara (1942-), Musician; guitarist for The Four Jays. 2 portraits.
Charles O'Hara (circa 1740-1802), Army officer and colonial governor. 1 portrait.
Damian O'Hara, Retail Assistant, National Portrait Gallery. 1 portrait.
Kane O'Hara, Irish playwright. 2 portraits.
Maureen O'Hara (1920-), Actress. 1 portrait.
Don Bernardo O'Higgins, Revolutionary. 1 portrait.
Georges Ohnet (1848-1918), French author. 2 portraits.
Yoshiro Ohta (1900-), Japanese tennis player. 3 portraits.
Christine Ohuruogu (1984-), Sprinter. 1 portrait.
Igor Davidovich Oistrakh (1931-), Violinist. 1 portrait.
Gertrude Alexander Okeden (née Williams), Wife of Ronald O. Alexander. 1 portrait.
Georgia O'Keefe (1887-1986), Artist. 1 portrait.
John O'Keeffe (1747-1833), Dramatist. 2 portraits.
Sir Menus William O'Keeffe (1859-1944), Major-General. 1 portrait.
Stephen Martin Lanigan O'Keeffe (1878-1948), High Commissioner in London for South Rhodesia 1935-46. 6 portraits.
Dennis O'Kelly (1720?-1787), Horse-owner and horse-breeder. 1 portrait.
Seán Thomas O'Kelly (1882-1966), President of Éire (Ireland). 1 portrait.
Fola Okesola (1974-), Heavyweight boxer. 2 portraits.
John Okey (died 1662), Parliamentary commander and regicide. 7 portraits.
Sophie Okonedo (1968-), Actress. 1 portrait.
Ben Okri (1959-), Novelist, poet and short story writer. 1 portrait.
Bay Fethi Okyar (died 1943), Turkish Ambassador to London 1934-9. 1 portrait.
Princess Ola Hassan. 5 portraits.
Sir Olateru (1910-1999), Nigerian Chief. 2 portraits.
Olaus (died 950), King of Sweden. 1 portrait.
Olav V, King of Norway (1903-1991), Reigned 1957-91. 9 portraits.
Edward Oldcorne (1561-1606), Jesuit. 4 portraits.
Claes Thure Oldenburg (1929-), Artist. 1 portrait.
John Oldershaw (died 1847), Archdeacon of Norfolk. 3 portraits.
Lady (Mary) Elizabeth Oldfield (née Murray) (1913-), Wife of Peter Carlton Oldfield; daughter of 8th Earl of Dunmore. 8 portraits.
Anne Oldfield (1683-1730), Actress. 5 portraits.
Bruce Oldfield (1950-), Fashion designer. 3 portraits.
Claude Houghton Oldfield (1889-1961), Novelist. 2 portraits.
Michael ('Mike') Oldfield (1953-), Musician and composer. 2 portraits.
Nina Oldfield, Actress. 4 portraits.
Sally Oldfield (1947-), Singer; songwriter; sister of Michael ('Mike') Oldfield. 1 portrait.
William John Oldfield (1857-1934), Canon of Lincoln Cathedral and author. 3 portraits.
Alun Bennett Oldfield-Davies (1905-1988), Controller, Welsh BBC. 2 portraits.
George Oldham, Vicar of St Paul's, Walden. 1 portrait.
Henry Oldham (1815-1902), Obstetric physician. 1 portrait.
Hugh Oldham (circa 1459-1519), Bishop of Exeter. 1 portrait.
John Oldham (1653-1683), Poet. 1 portrait.
Nathaniel Oldham (active 1728-circa 1747), Virtuoso; collector of curiosities. 1 portrait.
Richard Dixon Oldham (1858-1936), Geologist and seismologist. 2 portraits.
Angelica (née Pergami), Contessa Oldi (active 1815-1821), Lady of the bedchamber to Queen Caroline. 4 portraits.
Samuel Oldknow (1756-1828), High Sheriff of Derby. 1 portrait.
William Oldys (1696-1761), Norroy king-of-arms and antiquary. 1 portrait.
Arthur O'Leary (1729-1802), Roman Catholic priest and religious controversialist. 1 portrait.
Tom Evelyn O'Leary (1862-1924), Brigadier-General. 5 portraits.
Olga, Queen of Württemberg (1822-1892), Consort of Charles I, King of Württemberg; daughter of Nicholas I, Emperor of Russia. 1 portrait.
Queen Olga of Greece (1851-1926), Wife of King George I of Greece. 4 portraits.
Olga Alexandrovna, Grand Duchess of Russia (1882-1960), Wife of Peter Alexandrovich, Duke of Oldenburg and later wife of Nikolai Alexandrovich Kulikovsky; daughter of Alexander III, Emperor of Russia. 1 portrait.
Olga, Grand Duchess of Russia (1895-1918), Daughter of Nicholas II, Emperor of Russia. 8 portraits.
Olga Romanoff, Princess Romanova (1950-), Daughter of Andrei Aleksandrovich Romanov, Prince of Russia. 1 portrait.
Olga Feodorovna, Grand Duchess of Russia (1839-1891), Wife of Michael Nikolaevich, Grand Duke of Russia; daughter of Leopold, Grand Duke of Baden. 1 portrait.
Wallace ('Wally') Olins (1930-), Corporate identity and global brand consultant. 1 portrait.
Sir Lancelot Oliphant (1881-1965), Diplomat. 5 portraits.
Laurence Oliphant (1829-1888), Diplomatist and traveller. 1 portrait.
Margaret Oliphant Wilson Oliphant (1828-1897), Novelist. 2 portraits.
Sir Marcus Laurence Elwin ('Mark') Oliphant (1901-2000), Physicist involved in developing the atomic bomb. 6 portraits.
Fernandez Olissiponen (died 1570), Jesuit Missionary. 1 portrait.
Edyth Olive (Mrs Arthur Applin) (1872-1956), Actress. 3 portraits.
Anne Oliver (1593-1672), Wife of Peter Oliver. 1 portrait.
Anne Madeline Bessie Ghislaine Oliver (née Batho) (1938-), Wife of Stephen Robert Morgan Oliver; daughter of Sir Maurice Benjamin Batho, 2nd Bt. 3 portraits.
Anthony Oliver (1923-1995), Actor. 1 portrait.
Dame Beryl Oliver (1882-1972), Head of V.A.D. Department. 6 portraits.
Charles Pye Oliver (1861-1951), Physician to the King. 2 portraits.
Emma Sophia Oliver (née Eburne) (1819-1885), Landscape painter; wife of William Oliver. 1 portrait.
Sir (Frederick) Ernest Oliver (1900-1994), Chairman of George Oliver (Footwear) Ltd. 2 portraits.
Ethel Oliver, Actress. 10 portraits.
Sir Geoffrey Nigel Oliver (1898-1980), Admiral. 1 portrait.
George Oliver (1782-1867), Freemason, topographer, writer and rector. 1 portrait.
Sir Henry Francis Oliver (1865-1965), Admiral of the Fleet. 4 portraits.
Isaac Oliver (circa 1565-1617), Miniature painter. 5 portraits.
Jane Oliver (Helen Christina Easson Rees) (1904-1970), Writer. 27 portraits.
Meriel Edith Milicent Oliver (née Moore) (1936-), Daughter of Sir Alan (Hilary) Moore, 2nd Bt; wife of John Oliver. 3 portraits.
Martha Cranmer ('Pattie') Oliver (1834-1880), Actress. 4 portraits.
Peter Oliver (circa 1594-1647), Miniature painter; eldest son of Isaac Oliver. 4 portraits.
Robert Don Oliver (1895-1980), Vice-Admiral. 5 portraits.
Sir Roland Giffard Oliver (1882-1967), Judge of High Court of Justice. 2 portraits.
R.A. Oliver, Admiral. 1 portrait.
Sir Thomas Oliver (1852-1942), Physician and industrial hygienist. 1 portrait.
Vic Oliver (1897-1964), Comedian, actor and musician. 1 portrait.
Victor Oliver (1898-1964), Conductor. 1 portrait.
Mrs Oliver. 1 portrait.
Miss Oliver (active 1765). 1 portrait.
John Oliver-Bellasis (died 1979), Lieutenant-Colonel. 3 portraits.
Thomas Olivers (baptised 1725-1799), Methodist preacher and hymn writer. 1 portrait.
Laurence Kerr Olivier, Baron Olivier (1907-1989), Actor, producer and director. 81 portraits.
Sydney Haldane Olivier, 1st Baron Olivier (1859-1943), Civil servant, politician and author. 5 portraits.
Edith Olivier (1872-1948), Writer; Mayor of Wilton. 11 portraits.
Hon. Julie Kate Olivier (1966-), Actress; daughter of Laurence Olivier and Joan Plowright. 1 portrait.
Noel Olivier (1892-1969), Doctor. 2 portraits.
Hon. Richard Olivier (1961-), Theatre director; son of Laurence Olivier and Joan Plowright. 2 portraits.
Hon. Tamsin Olivier (1963-), Actress; daughter of Laurence Olivier and Joan Plowright. 1 portrait.
William Herbert Olivier (1904-1992), Lieutenant-Colonel. 11 portraits.
Dame Kathleen Ollerenshaw (née Timpson) (1912-), Mathematician and educationalist. 1 portrait.
John Sheldon Olliff (died 1951), Tennis player. 5 portraits.
Alfred Ollivant (1798-1882), Bishop of Llandaff. 3 portraits.
(Olivier) Émile Ollivier (1825-1913), Politician. 1 portrait.
Sir Colman Michael O'Loghlen, 2nd Bt (1819-1877), Irish lawyer and politician. 1 portrait.
Sir William Olpherts (1822-1902), Army officer. 1 portrait.
Julius Olsson (1864-1942), Marine painter. 3 portraits.
Isaac Oluwole (died 1932), Assistant Bishop of Lagos. 1 portrait.
Redivivus Oliver. 1 portrait.
Pierce Charles de Lacy O'Mahony (né Mahony) (1850-1930), Politician and philanthropist. 1 portrait.
Omai (circa 1753-circa 1780), First Tahitian to visit England. 5 portraits.
C. O'Malley. 1 portrait.
Ellen O'Malley (died 1961), Actress. 1 portrait.
George O'Malley (died 1843), Major-General. 1 portrait.
Sir Owen St Clair O'Malley (1887-1974), British Ambassador to Poland and Portugal. 5 portraits.
Tony O'Malley (1913-2003), Painter. 2 portraits.
William O'Malley (1853-1939), Politician and journalist. 7 portraits.
William Joseph O'Malley (1892-1917), Accountant and army officer; son of William O'Malley. 2 portraits.
Qaboos Bin Said Al Said, Sultan of Oman (1940-). 1 portrait.
Charles Oman (died 1825), Vintner's boy. 1 portrait.
Sir Charles William Chadwick Oman (1860-1946), Conservative MP, Professor of Modern History at Oxford University. 7 portraits.
Kate O'Mara (1939-), Actress. 1 portrait.
Joan Cowell O'Meara (née Ridley) (1903-1983), Tennis player. 3 portraits.
Charles Vernon Ommanney (1872-1952), Lieutenant-Colonel, Indian Army. 2 portraits.
Sir Erasmus Ommanney (1814-1904), Admiral. 1 portrait.
Francis Downes Ommanney (1903-1980), Marine Biologist. 4 portraits.
Honoria Catherine Ommanney (née Lawrence), Wife of Charles Vernon Ommanney. 2 portraits.
Sir John Acworth Ommanney (1773-1855), Admiral. 3 portraits.
Thomas Arthur O'Mullally (Count Lally de Tolendal) (1702-1766), Soldier. 2 portraits.
Jacqueline Lee Bouvier Kennedy Onassis (1929-1994), Publisher and editor; wife of John Kennedy and later Aristotle Onassis. 9 portraits.
Johann Gerhard Oncken (1800-1884), Baptist preacher. 1 portrait.
Michael Ondaatje (1943-), Writer. 1 portrait.
Sir (Philip) Christopher Ondaatje (1933-), Financier, writer, philanthropist and patron of the arts. 3 portraits.
Catherine Maria O'Neal (died 1796), Actress; third wife of Charles Lee Lewes. 1 portrait.
Charlie O'Neale (1978-), Model. 1 portrait.
Mary John Onebye (died 1669), Wife of the antiquary Thomas Staveley. 1 portrait.
Henry Nelson O'Neil (1817-1880), Painter. 2 portraits.
Peggy O'Neil (1898-1960), Actress and singer. 5 portraits.
Charles Henry St John O'Neill, Earl O'Neill (1779-1841), Landowner. 1 portrait.
Onora Sylvia O'Neill, Baroness O'Neill of Bengarve (1941-), Philosopher, writer and academic. 2 portraits.
Anne Geraldine Mary O'Neill (née Charteris), Lady O'Neill (1913-1981), Former wife of 3rd Baron O'Neill, former wife of 2nd Viscount Rothermere, and later wife of Ian Lancaster Fleming. 3 portraits.
Charles O'Neill (1849-1918), Politician. 1 portrait.
Sir Con Douglas Walter O'Neill (1912-1988), Foreign Office ambassador. 1 portrait.
Hon. (Louisa) Henrietta Valdivia O'Neill (1879-1965), Daughter of 2nd Baron O'Neill; wife of Charles Edward Norman Leith-Hay. 10 portraits.
Herbert Charles O'Neill (1879-1953), Journalist and editor. 1 portrait.
John O'Neill (1778-1858), Shoemaker, poet and author. 1 portrait.
Norman O'Neill (1875-1934), Composer. 1 portrait.
Oona Chaplin (née O'Neill) (1925-1991), Wife of Charlie Chaplin. 2 portraits.
Sir Phelim O'Neill (1604?-1653), Irish rebel. 2 portraits.
Robert John O'Neill (1936-), Academic, war historian and strategist. 1 portrait.
Terry O'Neill (1938-), Photographer. 2 portraits.
Charles Talbut Onions (1873-1965), Librarian and philologist. 1 portrait.
(George) Oliver Onions (1873-1961), Novelist. 2 portraits.
Yoko Ono (1933-), Artist; second wife of John Lennon. 7 portraits.
George Onslow, 1st Earl of Onslow (1731-1814), Politician. 2 portraits.
Thomas Onslow, 2nd Earl of Onslow (1755-1827), Eldest son of George Onslow, 1st Earl of Onslow. 1 portrait.
William Hillier Onslow, 4th Earl of Onslow (1853-1911), Governor of New Zealand. 8 portraits.
Richard William Alan Onslow, 5th Earl Onslow (1876-1945), Diplomat and civil servant. 4 portraits.
Richard Onslow, 1st Baron Onslow (1654-1717), Speaker of the House of Commons. 5 portraits.
Lady June Ann Onslow (née Hay) (1932-2002), Daughter of George Harley Hay, 14th Earl of Kinnoull; wife of Cranley Gordon Douglas Onslow, Baron Onslow of Woking. 5 portraits.
Lady Mary Florence Violet Margaret Onslow (Lady Garside) (1908-1970), Former wife of George Garside; daughter of 5th Earl of Onslow. 6 portraits.
Arthur Onslow (1691-1768), Speaker of the House of Commons. 13 portraits.
Arthur Onslow (1746-1817), Dean of Worcester. 1 portrait.
Denzil Roberts Onslow (1839-1908), MP for Guildford. 1 portrait.
Frank Herbert Onslow (1899-1970), Son of M.R.S. Onslow. 9 portraits.
George Onslow (1731-1792), Politician. 1 portrait.
Guildford James Hillier Onslow (1814-1882), Politician. 2 portraits.
Hon. Lena Barbara Joan Onslow (née Ogilvie-Grant) (1907-1981), Wife of Frank Herbert Onslow; daughter of Trevor Ogilvie-Grant, 4th Baron Strathspey. 26 portraits.
Maud Onslow, Hair stylist. 1 portrait.
Sir Richard Onslow, Bt (1741-1817), Admiral. 3 portraits.
Richard Onslow (1527 or 1528-1571), Lawyer and Speaker of the House of Commons. 1 portrait.
Sir Richard George Onslow (1904-1975), Admiral. 1 portrait.
Roger Cranley Seafield Onslow (1935-), Son of Frank Herbert Onslow. 6 portraits.
Gourishanker Oodeshanker (born 1805), Indian administrator. 1 portrait.
Lady Susan Harriet Catherine Opdebeck (née Douglas-Hamilton) (1814-1889), Figure of scandal. 1 portrait.
W. Openshaw. 1 portrait.
Amelia Opie (1769-1853), Novelist and poet; second wife of John Opie. 7 portraits.
Evelyn Arnold Opie (1905-1990), Matron of King's College Hospital. 3 portraits.
Iona Margaret Balfour Opie (1923-), Folklorist. 1 portrait.
John Opie (1761-1807), Portrait and history painter. 12 portraits.
Julian Opie (1958-), Artist. 1 portrait.
Mary Opie (née Bunn) (active 1782-1795), First wife of John Opie; later married Major Edwards. 1 portrait.
William Alfred Opie (1901-1977), Air Vice-Marshal. 1 portrait.
Nevada, Duchess of Oporto (1885-1941), Wife of Prince Alfonso of Braganza, Duke of Oporto. 1 portrait.
Julie Opp (Mrs William Faversham) (1871-1921), Actress. 1 portrait.
Mr A.P. Oppé. 1 portrait.
Lady Bridget Sarah Oppenheim (née Sinclair) (1947-), Wife of Nicholas Anthony Oppenheim; daughter of 19th Earl of Caithness. 2 portraits.
Sir Duncan Morris Oppenheim (1904-2003), Businessman, artist and arts administrator. 1 portrait.
Edward Phillips Oppenheim (1866-1946), Novelist. 11 portraits.
Elsie Oppenheim (née Hopkins), Wife of Edward Phillips Oppenheim. 1 portrait.
Geraldine Oppenheim, Daughter of Edward Phillips Oppenheim. 2 portraits.
Sally Oppenheim-Barnes, Baroness Oppenheim-Barnes (1930-), Administrator and politician. 1 portrait.
Michael Bernard Grenville Oppenheimer, 3rd Baron Oppenheimer (1924-), University lecturer in politics. 3 portraits.
(Laetitia) Helen (née Munro-Lucas-Tooth), Lady Oppenheimer (1926-), Writer on moral and philosophical theology; wife of Sir Michael Oppenheimer, 3rd Bt; daughter of Sir Hugh Munro-Lucas-Tooth, 1st Bt. 14 portraits.
Mrs Louis Oppenheimer. 5 portraits.
Max Ophuls (né Max Oppenheimer) (1902-1957), German director. 2 portraits.
Alison Opyrchal, Archive Assistant, National Portrait Gallery. 1 portrait.
Edward Oram (active 1766-1799), Landscape painter. 1 portrait.
James Oram, Cloakroom Attendant, House of Commons. 1 portrait.
Sir Matthew Henry Oram (1885-1969), Barrister. 1 portrait.
Walter Charles Oram, Physician. 1 portrait.
Frederick Henry, Prince of Orange, Count of Nassau (1584-1647), Prince of Orange. 16 portraits.
Sir Hugh William Orange (1866-1956), Educationist. 2 portraits.
Jason Orange (1970-), Musician; dancer and singer for Take That. 1 portrait.
Willem George Frederik, Prince of Orange Nassau (1774-1799), Soldier. 1 portrait.
Dominick Browne, 1st Baron Oranmore and Browne (1787-1860), MP for County Mayo. 1 portrait.
Christina (née Guthrie), Lady Oranmore and Browne (died 1887), Wife of 2nd Baron Oranmore and Browne; daughter of Alexander Guthrie. 1 portrait.
Geoffrey Henry Browne, 3rd Baron Oranmore and Browne (1861-1927), Irish politician. 5 portraits.
Olwen Verena (née Ponsonby), Lady Oranmore and Browne (1876-1927), Wife of 3rd Baron Oranmore and Browne; daughter of 8th Earl of Bessborough. 3 portraits.
Dominick Geoffrey Edward Browne, 4th Baron Oranmore and Browne (1901-2002), Son of 3rd Baron Oranmore and Browne. 7 portraits.
Mildred Helen (née Egerton), Lady Oranmore and Browne (later Hon. Mrs Dalrymple) (1903-1980), First wife of 4th Baron Oranmore and Browne. 3 portraits.
Maurice Orbach (1902-1979), MP. 11 portraits.
Roy Kelton Orbison (1936-1988), Singer and songwriter. 1 portrait.
Bill Orchard (1940-), Photographer. 1 portrait.
Henry Ben Orchard (died 1937), Chief Accountant of the Bank of England. 2 portraits.
Paul Orchard (1739-1812), Politician. 1 portrait.
Robert Orchard (active 1803), Grocer and tea dealer in Soho. 1 portrait.
William Edwin Orchard (1877-1955), Roman Catholic priest and theologian. 1 portrait.
Ellen (née Moxon), Lady Orchardson (died 1917), Wife of Sir William Quiller Orchardson; daughter of Charles Moxon. 1 portrait.
Sir William Quiller Orchardson (1832-1910), Portrait and subject painter. 18 portraits.
Baroness Orczy (1865-1947), Novelist. 9 portraits.
Boris Ord (1897-1961), Organist, composer and choirmaster. 1 portrait.
William Ord (1781-1855), MP. 2 portraits.
Lady Eileen Orde (1887-1952), Wife of Cuthbert Julian Orde; daughter of 4th Duke of Wellington. 6 portraits.
Jane Orde (1921-1995), Daughter of Cuthbert Julian Orde. 4 portraits.
Sir John Orde, Bt (1751-1824), Naval officer and politician. 1 portrait.
Julian Orde (1918-1970s), Daughter of Cuthbert Julian Orde. 4 portraits.
Max O'Rell (1848-1903), Author, traveller and lecturer. 1 portrait.
Edward Russell, Earl of Orford (1652-1727), Admiral. 13 portraits.
Louise Melissa (Corbin), Countess of Orford (died 1909), Daughter of D.C. Corbin of New York; 1st wife of 5th Earl of Orford. 15 portraits.
Emily Gladys Walpole (née Oakes), Countess of Orford, Second wife of Robert Horace, 5th Earl of Orford. 10 portraits.
Robert Walpole, 1st Earl of Orford (1676-1745), Prime Minister. 27 portraits.
Robert Walpole, 2nd Earl of Orford (1701-1751). 1 portrait.
George Walpole, 3rd Earl of Orford (1730-1791), Rake and eccentric. 6 portraits.
Horatio ('Horace') Walpole, 4th Earl of Orford (1717-1797), Writer and collector. 20 portraits.
Horatio Walpole, 1st Earl of Orford (1723-1809). 2 portraits.
Horatio Walpole, 2nd Earl of Orford (1752-1822). 1 portrait.
Horatio William Walpole, 4th Earl of Orford (1813-1894), Landowner. 2 portraits.
John Foster, 1st Baron Oriel (1740-1828), Speaker of the Irish House of Commons. 1 portrait.
Cait O'Riordan (1965-), Bass guitarist; wife of Elvis Costello. 1 portrait.
George Hamilton, 1st Earl of Orkney (1666-1737), Army officer. 5 portraits.
Mary (née O'Brien), Countess of Orkney (1755-1831), Countess in her own right; wife of 1st Marquess of Thomond. 2 portraits.
Charlotte Isabella (née Irby), Countess of Orkney (1807-1883), Wife of 5th Earl of Orkney; daughter of 3rd Baron Boston. 2 portraits.
Henrietta Anne, Duchess of Orleans (1644-1670), Daughter of Charles I. 19 portraits.
Prince Henri d'Orleans (1867-1901), Son of Duc de Chartres. 2 portraits.
Philippe, 9th Duc d'Orleans (1869-1926), Head of the Bourbon family. 6 portraits.
Eugene Adelaide Louise d'Orleans (1777-1847). 1 portrait.
Louis Philippe Joseph (Philippe Egalité), duc d'Orleans (1747-1793). 4 portraits.
Marie Clementine Caroline Leopoldine d'Orleans (1817-1907), Daughter of Louis Philippe. 2 portraits.
Augustus Henry Orlebar (1897-1943), RAF Officer; First World War flying ace. 1 portrait.
Michel Fedorowitsch Orloff (died 1861), Russian general. 1 portrait.
Count Serge Orloff-Davidoff, Foreign dignitary; husband of Hon. Elizabeth Scott-Ellis; 2nd daughter of Lord and Lady Howard De Walden. 2 portraits.
Count Grigorii Grigorievich Orlov (1734-1783), Russian statesman. 1 portrait.
Count Alexis Grigorievich Orlov-Tchesmensky (1734-1808), Russian statesman. 1 portrait.
John Benn-Walsh, 1st Baron Ormathwaite (1798-1881), Politician. 1 portrait.
Arthur Walsh, 2nd Baron Ormathwaite (1827-1920), Landowner and politician. 4 portraits.
Katherine Emily Mary (née Somerset), Lady Ormathwaite (1834-1914), Wife of 2nd Baron Ormathwaite; daughter of 7th Duke of Beaufort. 1 portrait.
Arthur Henry John Walsh, 3rd Baron Ormathwaite (1859-1937), Politician and Lord-Lieutenant and President of the Territorial Force, County of Radnor. 3 portraits.
Denise Orme (née Jessie Smither) (1884-1960), Actress and singer. 2 portraits.
Denise Orme (Jessie (née Smither), Duchess of Leinster) (1884-1960), Actress and singer; former wife of 3rd Baron Churston and of Theodore William Wessel; third wife of 7th Duke of Leinster; daughter of Alfred John Smither. 2 portraits.
Frank Leslie Orme (1898-1968), Lieutenant-Colonel, Director of Royal Insurance Co. Lt and High Sheriff of Cheshire. 2 portraits.
Malcolm Orme (circa 1805-1878), Proctor. 1 portrait.
Robert Orme (1728-1801), Historian of India and East India Company servant. 1 portrait.
Thomas Orme (active 1688), Soldier and one of the 'Portsmouth Captains' cashiered in 1688. 3 portraits.
Eleanor Anne Ormerod (1828-1901), Entomologist. 1 portrait.
George Ormerod (1785-1873), County historian. 1 portrait.
Agnes Lucy Ormiston (née Benniworth) (died 1942), Wife of Thomas Lane Ormiston. 3 portraits.
Thomas Lane Ormiston (1867-1954), Lieutenant-Colonel and Justice of the Peace. 2 portraits.
Julia Karin Ormond (1965-), Actress. 1 portrait.
Leonée Ormond (née Jasper) (1940-), Art historian. 1 portrait.
Marguerite Ormond (born 1892), John Singer Sargent's niece. 2 portraits.
Marie Marguerite Renet Ormond (1847-1925), Mother-in-law to John Singer Sargent's sister Violet Ormond (née Sargent). 1 portrait.
Richard Louis Ormond (1939-), Art historian; Former Director of the National Maritime Museum. 8 portraits.
James Butler, 9th Earl of Ormond and Ossory (1504-1564), Soldier. 1 portrait.
James Butler, 1st Duke of Ormonde (1610-1688), Royalist soldier and statesman. 17 portraits.
James Butler, 2nd Duke of Ormonde (1665-1745), Soldier and Jacobite. 26 portraits.
Mary (Somerset), Duchess of Ormonde (1665-1733), Second wife of James Butler, 2nd Duke of Ormonde. 11 portraits.
John Butler, 2nd Marquess of Ormonde (1808-1854). 2 portraits.
James Edward William Theobald Butler, 3rd Marquess of Ormonde (1844-1919), Landowner. 4 portraits.
Elizabeth Harriet (née Grosvenor), Marchioness of Ormonde (1856-1928), Wife of 3rd Marquess of Ormonde; daughter of 1st Duke of Westminster. 2 portraits.
James Arthur Wellington Foley Butler, 4th Marquess of Ormonde (1849-1943), State Steward to Earl of Canarvon when Viceroy of Ireland. 3 portraits.
Susan Frances Elizabeth (Wandesford), Countess of Ormonde (1754-1830), Wife of John Butler, 17th Earl of Ormonde. 1 portrait.
Peter Charles Ormrod (1922-2007), Colonel. 9 portraits.
Emmeline Ormsby (active 1880s), Actress. 1 portrait.
Hon. Seymour Fitzroy Ormsby-Gore (1863-1950), Stockbroker and politician; son of 2nd Baron Harlech. 2 portraits.
William Ormsby-Gore (1779-1860), Politician and great great grandfather of William Ormsby-Gore, 4th Baron Harlech. 1 portrait.
Frederick Charles O'Rorke (1879-1976), Soldier and Government Veterinary Officer. 3 portraits.
Martin O'Rourke (active early 19th century), Swimmer. 1 portrait.
Sir William Orpen (1878-1931), Painter. 26 portraits.
Edward Orpin (died 1781), Parish clerk. 1 portrait.
Alexandra Sutherland Orr (née Leighton) (1828-1903), Biographer of Robert Browning; sister of Lord Leighton. 1 portrait.
Sir Charles William James Orr (1870-1945), Governor and Commander-in-Chief of The Bahamas 1926-31. 1 portrait.
Christopher John ('Chris') Orr (1943-), Artist; Professor and Course Director of Printmaking at the Royal College of Art. 2 portraits.
Patricia Orr (née Morris) (died 1854), Sister of Sophia Finlay. 1 portrait.
Robin Orr (Robert Kemsley Orr) (1909-2006), Composer and Professor of Music. 1 portrait.
Carolina Alexina Orred (née Lane-Fox) (1845-1924), Wife of John Cavendish Orred; daughter of George Lane-Fox. 1 portrait.
John Cavendish Orred (1841-1905), Landowner and army officer. 1 portrait.
Matilda Orred (née Thistlethwayte) (died 1879), Wife of George Orred; daughter of Thomas Thistlethwayte. 1 portrait.
M. Orred, Daughter of George Orred. 1 portrait.
Charles Boyle, 4th Earl of Orrery (1674-1731), Soldier and scholar. 3 portraits.
(Charles) Ian Orr-Ewing, Baron Orr-Ewing (1912-1999), Consultant and director of various companies; Politician. 13 portraits.
Sir Ian Leslie Orr-Ewing (1893-1958), Politician. 7 portraits.
Margaret Frances Susan (Innes-Ker), Lady Orr-Ewing (1875-1930), Daughter of 7th Duke of Roxburghe; wife of James Alexander Orr-Ewing. 1 portrait.
Sir Norman Archibald Orr Ewing, 4th Bt (1880-1960), Brigadier-General. 4 portraits.
Ronald Archibald Orr-Ewing (1912-2002). 2 portraits.
Doris Blanche Orr (née Lee), Lady Orr-Lewis, Daughter of Charles Lee; former wife of firstly Sir Walter Gibbons; later wife of Sir John Duncan Orr-Lewis, 2nd Bt. 3 portraits.
James Orrock (1829-1913), Painter and art collector. 4 portraits.
Albert William Thomas Orsborn (1886-1967), General of the Salvation Army. 3 portraits.
Phillis Orsborn (née Taylor), Leader of the Salvation Army Women's social work in Britain. 2 portraits.
Count Felice Orsini (1819-1858), Italian revolutionary. 1 portrait.
Christopher Orssich (1947-), Son of Count Robert Orssich. 1 portrait.
Paul Orssich, Son of Count Robert Orssich. 1 portrait.
Susan Orssich, Daughter of Count Robert Orssich. 1 portrait.
Countess Orssich, Wife of Count Robert Orssich; daughter of Lieutenant-colonel Sir Murrough John Wilson. 1 portrait.
Abraham Ortelius (Ortels) (1527-1598), Cartographer, geographer and creator of the first modern atlas. 1 portrait.
René Ortmans (1863-1949), Violinist. 1 portrait.
Arthur Orton (1834-1898), The Tichborne claimant. 16 portraits.
Beth Orton (1970-), Singer. 3 portraits.
Charles Orton, Brother of Arthur Orton, 'the Tichborne claimant'. 1 portrait.
George Orton, Shipping butcher, father of Arthur Orton, 'the Tichborne claimant'. 1 portrait.
Job Orton (1717-1783), Dissenting minister. 1 portrait.
John Kingsley ('Joe') Orton (1933-1967), Playwright. 11 portraits.
Mary Orton, Mother of Arthur Orton, 'the Tichborne claimant'. 1 portrait.
Mary Ann Orton (née Bryant) (born 1844), Wife of Arthur Orton, 'the Tichborne claimant'. 1 portrait.
George Orwell (Eric Arthur Blair) (1903-1950), Novelist and critic. 1 portrait.
Charles Stewart Orwin (1876-1955), Agricultural economist and historian. 2 portraits.
George Osbaldeston (1787-1866), Sportsman and eccentric. 3 portraits.
Sir Algernon Kerr Butler Osborn, 7th Bt (1870-1948), Justice of the Peace and major. 2 portraits.
Lady Beatrice Elliot Kennard Osborn (née Greenfield) (died 1963), Wife of Sir Algernon Osborn, 7th Bt; daughter of William Bunce Greenfield. 2 portraits.
Constance Violette (Rooke), Lady Osborn (died 1988), Justice of the Peace; wife of Sir Danvers Lionel Rouse Osborn, 8th Bt. 6 portraits.
Franz Osborn (1905-1955), Pianist. 1 portrait.
Sir Frederick James Osborn (1885-1978), Town and County Planner. 6 portraits.
Guy Osborn. 5 portraits.
Sir Samuel Osborn (1864-1952), Director of Samuel Osborn and Company Ltd. 1 portrait.
Shane Osborn (1970-), Chef. 1 portrait.
Sherard Osborn (1822-1875), Rear-Admiral and writer. 4 portraits.
Sue Osborn, Joint Chief Executive, National Patient Safety Agency. 1 portrait.
William Lushington Osborn (1871-1951), Army officer. 4 portraits.
Lady Olga Katherine Godolphin Osborne (1886-1929), Daughter of the 10th Duke of Leeds. 1 portrait.
Lord Sydney Godolphin Osborne (1808-1889), Philanthropist; son of 1st Baron Godolphin. 2 portraits.
Alexander Osborne (active 1794), Royal Edinburgh Volunteer, Inspector-General and Solicitor of Customs. 2 portraits.
Sir Cyril Osborne (1898-1969), Conservative MP for Louth Lincolnshire; Justice of the Peace. 13 portraits.
Edmund Archibald Osborne (1885-1969), Lieutenant-General. 2 portraits.
Edward Oliver Brudenell Seymour Osborne (1883-1956), Vice-Admiral. 4 portraits.
Elsie Osborne (née Gregory), Miniature painter; sister of Yvonne Gregory. 1 portrait.
George Osborne (1971-), Politician. 1 portrait.
John (James) Osborne (1929-1994), Playwright, autobiographer and actor. 17 portraits.
John William Willoughby Osborne (1833-1881), Army officer and colonial civil servant. 1 portrait.
Malcolm Osborne (1880-1963), Engraver and teacher. 1 portrait.
Ralph Bernal Osborne (1808?-1882), Liberal politician. 4 portraits.
Rosabelle Osborne (died 1958), Matron-in-Chief at the War Office. 1 portrait.
William Godolphin Osborne (1804-1899), Military secretary to the Governor General of India. 1 portrait.
Lord William Henry Osborne (1691-1711), Son of Peregrine Osborne, 2nd Duke of Leeds. 2 portraits.
(Samuel) Lloyd Osbourne (1868-1947), Novelist; stepson of Robert Louis Stevenson. 2 portraits.
John Michael ('Ozzy') Osbourne (1948-), Singer and songwriter. 1 portrait.
Oscar II, King of Sweden (1829-1907), Reigned 1872-1907. 3 portraits.
Patrick Joseph O'Shaughnessy (1872-1920), Politician. 3 portraits.
Prudence O'Shea, Actress. 2 portraits.
Tessie O'Shea (1914-1995), Singer and comedian. 9 portraits.
William Henry O'Shea (1840-1905), Irish politician. 1 portrait.
Sir William Osler, 1st Bt (1849-1919), Regius Professor of Medicine at Oxford. 1 portrait.
Hugh Edward Mark Osmond (1962-), Businessman. 1 portrait.
Miss Osmond, Actress. 1 portrait.
Elizabeth Sylvia Neville Osmond-Smith (née Moss) (born 1923), Wife of Francis Howard Osmond-Smith; daughter of Kenneth Neville Moss. 1 portrait.
Reska Fromatt Ospovat (Mrs Wells) (died 1952), Sister of Henry Ospovat. 2 portraits.
(John) Evelyn Denison, 1st Viscount Ossington (1800-1873), Speaker of the House of Commons. 11 portraits.
Charlotte (Cavendish-Bentinck), Viscountess Ossington (1806-1889), Daughter of 4th Duke of Portland; wife of Viscount Ossington. 1 portrait.
Thomas Butler, Earl of Ossory (1634-1680), Courtier and man of action. 5 portraits.
Aemilia Butler (née van Nassau), Countess of Ossory (1635-1688), Dutch-Anglo Courtier and wife of Thomas Butler, 6th Earl of Ossory. 3 portraits.
Count Osterman, Russian diplomat. 1 portrait.
Isidore Ostrer (1889-1975), Poet, financier and economist. 27 portraits.
Denis O'Sullivan (1868-1908), American actor and singer. 1 portrait.
Maureen O'Sullivan (1911-1998), Film actress. 3 portraits.
Oenone Venetia O'Sullivan (née Carew) (1929-), Wife of John O'Sullivan; daughter of Sir Thomas Palk Carew, 10th Bt. 3 portraits.
Ronnie O'Sullivan (1975-), Snooker player. 2 portraits.
Lady Mary Oswald (née Kennedy) (1799-1886), Wife of Richard Oswald; daughter of 1st Marquess of Ailsa. 1 portrait.
Alexander Oswald. 3 portraits.
Oswald Charles Williamson Oswald (1863-1938), Brigadier-General. 2 portraits.
Richard Alexander Oswald (1771-1841), MP for Ayrshire. 1 portrait.
Oswald. 1 portrait.
Carolina Otéro (1868-1965), Dancer and actress, known as 'La Belle Otéro'. 2 portraits.
Lisandro Otero González (1932-2008), Cuban novelist and journalist. 2 portraits.
Salvius Otho (32-69), Emperor of Rome A.D. 69. 1 portrait.
Arthur O'Toole (born 1538), Soldier of fortune. 1 portrait.
Gerard ('Ged') O'Toole, Musician. 1 portrait.
Kate O'Toole, Daughter of Peter O'Toole and Sian Phillips. 2 portraits.
Mark O'Toole (1964-), Musician; bassist for Fankie Goes To Hollywood. 2 portraits.
Peter O'Toole (1932-), Actor. 8 portraits.
Mrs Frank Otter, Australian foreign visitor. 1 portrait.
(Richard) Bruce Hamilton Ottley (1890-1947), Banker; supporter and connoisseur of music and the ballet; Chairman of the United Kingdom Gas Corporation. 3 portraits.
Fielding Hay Ottley (1877-1958), Hon. Canon of Canterbury. 1 portrait.
Otto von Habsburg, Archduke of Austria (1912-), Eldest son of Charles I of Austria; Politician. 3 portraits.
Otto, King of Greece (1815-1867), Son of King Louis I of Bavaria. 2 portraits.
Eliza Price Noble (née Campbell), Lady Otway (later Mrs Leathem) (died 1910), Wife of Sir George Graham Otway, 2nd Bt and later, wife of Thomas William Crawford Leathem; daughter of John Campbell. 7 portraits.
Sir George Graham Otway, 2nd Bt (1816-1881), Naval officer. 1 portrait.
Grace Otway (died 1935), Actress. 1 portrait.
Sir Robert Waller Otway, 1st Bt (1770-1846), Admiral. 1 portrait.
Sarah Otway, Wife of Francis Otway of River Hill, Kent. 2 portraits.
Thomas Otway (1652-1685), Dramatist. 8 portraits.
Mrs Otway (active late 18th century). 1 portrait.
Nicholas Oudart (active 1640), Secretary to Sir Edward Walker, Garter King of Arms. 1 portrait.
Vizier of Oudh. 1 portrait.
William Oughtred (1575-1660), Mathematician. 7 portraits.
Herman Ould (1885-1951), Dramatist, poet and critic. 6 portraits.
Walter William Ouless (1848-1933), Portrait painter. 10 portraits.
Brian Oulton (1908-1992), Actor. 1 portrait.
Thérèse Oulton (1953-), Painter. 2 portraits.
Wilfred Ewart Oulton (1911-1997), Air Vice-Marshal. 1 portrait.
Anna Caroline Oury (née de Belleville) (1808-1880), Pianist and composer. 1 portrait.
Herman George Ouseley, Baron Ouseley (1945-), Politician; President, Different Realities Partnership Ltd. 1 portrait.
Sir Frederick Arthur Gore Ouseley, 2nd Bt (1825-1889), Church musician and composer. 6 portraits.
Gideon Ouseley (1762-1839), Irish Methodist preacher. 1 portrait.
Sir Gore Ouseley, 1st Bt (1770-1844), Diplomat and oriental scholar. 3 portraits.
Sir James Outram, 1st Bt (1803-1863), Lieutenant-General. 10 portraits.
Joseph Outram (1766-1802), Diplomat and oriental scholar. 2 portraits.
Marjorie Isabella Outram, Physician; daughter of Sir Francis Davidson Outram. 2 portraits.
Ernest Carrington Ouvry (1866-1951), Solicitor. 1 portrait.
Horace Ové (1939-), Film-maker and photographer. 1 portrait.
John Overall (1560-1619), Bishop of Norwich. 11 portraits.
Johann Friedrich Overbeck (1789-1869), Painter. 1 portrait.
Sir Robert Leslie Overbury (1887-1955), Political secretary. 1 portrait.
Sir Thomas Overbury (1581-1613), Poet and courtier. 18 portraits.
Samuel Jones Loyd, 1st Baron Overstone (1796-1883), Banker. 3 portraits.
Harriet Wright, Baroness Overstone (died 1864), Daughter of Ichabod Wright; wife of Baron Overstone. 1 portrait.
Sir Arnold Edersheim Overton (1893-1975), Political secretary. 3 portraits.
John Overton (1639 or 1640-1713), Map and print publisher. 1 portrait.
Aida Overton Walker (1880-1914), Actress, dancer and singer. 3 portraits.
John Campbell White Overtoun, 1st Baron Overtoun (1843-1908), Philanthropist and chemical manufacturer. 4 portraits.
Stephen Michael James ('Steve') Ovett (1955-), Middle distance runner. 2 portraits.
Sir Esmond Ovey (1879-1963), Diplomat. 2 portraits.
David Anthony Llewellyn Owen, Baron Owen (1938-), Politician. 7 portraits.
Sir Alfred George Beech Owen (1908-1975), Director. 1 portrait.
Alun Davies Owen (1925-1994), Playwright. 3 portraits.
Caroline Owen, Niece of Wenda Parkinson (née Rogerson). 1 portrait.
C. Owen, President of the Finchley Harriers. 1 portrait.
David Owen, Politician. 1 portrait.
David Lanyon Lloyd Owen (1917-), Major-General. 1 portrait.
Dawn Owen, Tennis player; daughter of Sefton Owen. 1 portrait.
Pat Owen, Tennis player; daughter of Sefton Owen. 1 portrait.
Sir Douglas Owen (1850-1920), Barrister. 4 portraits.
Sir Edward Campbell Rich Owen (1771-1849), Naval officer. 1 portrait.
Edward Rodney Owen (born 1856), Sportsman. 1 portrait.
Emmie Owen (1871-1905), Actress and opera singer. 1 portrait.
Frank Owen (1905-1979), Journalist, writer and broadcaster. 8 portraits.
George Douglas Owen (1887-1965), Colonial secretary. 1 portrait.
Sir Goronwy Owen (1881-1963), Liberal MP for Caernarvonshire; Lieutenant-Colonel. 4 portraits.
Hugh Owen (1784-1861), Soldier in service of Portugal. 1 portrait.
Sir Hugh Owen (1835-1916), Public health and water local government commissioner. 1 portrait.
James Owen (1654-1706), Nonconformist minister. 1 portrait.
Sir John Owen (1600-1666), Welsh royalist. 3 portraits.
John Owen (1563 or 1564-1622?), Latin poet. 8 portraits.
John Owen (1616-1683), Puritan divine. 22 portraits.
John Owen (1766-1822), Missionary society administrator. 1 portrait.
Sir (William) Leonard Owen (1897-1971), Atomic engineer. 8 portraits.
Leslie Owen (1886-1947), Bishop of Lincoln. 3 portraits.
L.G. Owen, Tennis player. 1 portrait.
Hon. Margaret Owen (née Denman) (1815-1899), Former wife of Henry William Macaulay and Edward Cropper, and wife of John Owen; daughter of 1st Baron Denman. 1 portrait.
Mark Owen (1972-), Singer and songwriter; member of Take That. 1 portrait.
Michael Owen (1979-), Footballer. 1 portrait.
Nicholas Owen (died 1606), Carpenter and Jesuit lay brother. 1 portrait.
Philip Loscombe Wintringham Owen (1920-), Lawyer, MP and Justice of the Peace. 10 portraits.
Sir Richard Owen (1804-1892), Naturalist, comparative anatomist and palaeontologist. 28 portraits.
Robert Owen (1771-1858), Pioneer of practical socialism. 6 portraits.
Rowland Hubert Owen (1903-1995), Senior UK trade commissioner in India, Burma and Ceylon. 2 portraits.
Ruth Owen (née Knaggs), Wife of George Douglas. 1 portrait.
Samuel Owen (1769-1857), Watercolour painter. 1 portrait.
Sidney George Owen (1858-1940), Classical scholar. 2 portraits.
S. Owen. 1 portrait.
Ursula Margaret Owen (1937-), Co-founder and Managing Director, Virago Books; Editor and Chief Executive, Index on Censorship. 3 portraits.
Wilfred Owen (1893-1918), Poet. 1 portrait.
William James Owen (1901-1981), Politician; Adult education class teacher and lecturer. 3 portraits.
Patricia Owens (1925-2000), Actress. 1 portrait.
Dame Anne Elizabeth Owers (née Spark) (1947-), Campaigner, administrator and policy advisor; HM Chief Inspector of Prisons. 1 portrait.
William Owtram (Outram) (baptised 1626-1679), Church of England clergyman. 1 portrait.
Henry Oxburgh (died 1716), Jacobite Insurgent. 3 portraits.
Marie Adelaide Oxenbridge (née Maude) (died 1897), Daughter of Cornwallis Maude, 3rd Viscount Hawarden; former wife of Charles Anderson Worsley, 2nd Earl of Yarborough, and later wife of William J. Monson, Viscount Oxenbridge. 1 portrait.
Helen Oxenbury (1935-), Children's books illustrator. 1 portrait.
Elizabeth Oxenden (née Wilson), First wife of Montagu Oxenden; daughter of Richard Wilson. 1 portrait.
Sir Henry Oxenden, 7th Bt (1756-1838). 1 portrait.
Montagu Oxenden (1799-1880), Clergyman; son of Sir Henry Oxenden, 7th Bt. 1 portrait.
John Oxenford (1812-1877), Playwright and translator. 1 portrait.
John Oxenham (died 1941), Writer. 3 portraits.
William Oxenham (1800-1863), Teacher and religious writer. 1 portrait.
John de Vere, 15th Earl of Oxford (1490?-1540), Courtier. 2 portraits.
Edward de Vere, 17th Earl of Oxford (1550-1604), Courtier. 3 portraits.
Henry de Vere, 18th Earl of Oxford (1593-1625), Hereditary Great Chamberlain. 3 portraits.
Robert de Vere, 19th Earl of Oxford (1575-1632), Soldier and nobleman. 3 portraits.
Aubrey de Vere, 20th Earl of Oxford (1626-1703), Soldier. 2 portraits.
Robert Harley, 1st Earl of Oxford (1661-1724), Politician. 14 portraits.
Edward Harley, 2nd Earl of Oxford (1689-1741), Patron of letters and collector. 12 portraits.
Jane Elizabeth (née Scott), Countess of Oxford (1773-1824), Wife of Edward Harley, 5th Earl of Oxford. 2 portraits.
Herbert Henry Asquith, 1st Earl of Oxford and Asquith (1852-1928), Prime Minister. 60 portraits.
Margaret Emma Alice ('Margot', née Tennant), Countess of Oxford and Asquith (1864-1945), Society hostess. 47 portraits.
Julian Edward George Asquith, 2nd Earl of Oxford and Asquith (1916-2011), Colonial administrator. 2 portraits.
(John) Donald Alexander Arthur Makgill, 12th Viscount Oxfuird (1899-1986). 1 portrait.
Robert Dickinson Oxland (1889-1959), Air Vice-Marshal. 3 portraits.
Elizabeth Oxley (active 1679), Maid to Mr Bird. 1 portrait.
Reginald Stewart Oxley (1863-1951), Army officer. 5 portraits.
William Oxman (or Orsingham) (active 1660s), Preacher of the doctrines of the Fifth Monarchy Men. 2 portraits.
Robert Wardlow Oxspring (1919-1989), Group Captain. 3 portraits.
Jan Oyra (born 1888), Dancer. 7 portraits.
William Maingay Ozanne (1891-1966), Major-General. 6 portraits.
Rifat Ozbek (1953-), Fashion designer. 2 portraits.
