Edward O'Brien (floruit 1797). 2 portraits.
Edward Joseph Harrington O'Brien (1890-1941), Editor and anthologist. 2 portraits.
Erin O'Connor (1978-), Fashion model. 2 portraits.
Feargus Edward O'Connor (1796?-1855), Chartist leader. 3 portraits.
Frank O'Connor (Michael Francis Xavier O'Donovan) (1903-1966), Writer. 2 portraits.
Bernard O'Donoghue (1945-), Poet. 1 portrait.
William Joseph O'Malley (1892-1917), Accountant and army officer; Son of William O'Malley. 2 portraits.
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), Married firstly 3rd Baron O'Neill; secondly 2nd Viscount Rothermere; thirdly Ian Lancaster Fleming. 3 portraits.
Oona Chaplin (née O'Neill) (1925-1991), Wife of Charlie Chaplin. 2 portraits.
Martin O'Rourke (floruit early 19th century), Swimmer. 1 portrait.
Della Oake, Fashion model. 1 portrait.
Sir Charles John Oakeley, 5th Bt (1862-1938), Justice of the Peace. 7 portraits.
Lady Helena Oakeley (née Beatson) (died 1839), Artist; wife of Sir Charles Oakeley, Bt. 3 portraits.
Sir Herbert Stanley Oakeley (1830-1903), Composer. 1 portrait.
Sir Cecil Oakes (1884-1959), Alderman. 3 portraits.
Sir Hildebrand Oakes (1754-1822), Lieutenant-General. 3 portraits.
Philip Barlow Oakes (1928-2005), Scriptwriter, broadcaster, film critic and poet. 1 portrait.
Sir Walter Fraser Oakeshott (1903-1987), Vice-Chancellor of Oxford University. 1 portrait.
Philip Oakey (1955-), Pop musician; member of 'The Human League'. 1 portrait.
Alfred James Oakley (1880-1959), Sculptor. 4 portraits.
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 and Chancellor of Exchequer. 2 portraits.
Richard Oastler (1789-1861), Reformer. 1 portrait.
Lawrence Edward Grace Oates (1880-1912), Antarctic explorer. 2 portraits.
Mark Oates (floruit 1799), Captain in the Royal Marines. 1 portrait.
Simon Oates, Actor. 1 portrait.
Titus Oates (1649-1705), Informer. 23 portraits.
Verity Oates, Suffragette. 1 portrait.
Alastair Oatey, Personnel Assistant, National Portrait Gallery. 1 portrait.
Charles William Oatley (1904-1996), Professor of Electrical Engineering. 1 portrait.
Charles Obach (1841-1921), Art dealer; Founder of Obach & Co.. 1 portrait.
Robert Obbard (floruit 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. 5 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.
Graeme Obree (1965-), Cyclist. 2 portraits.
Patrick O'Brian (Richard Patrick Russ) (1914-2000), Novelist. 1 portrait.
Alice O'Brien, Actress. 6 portraits.
Brian O'Brien (died 1973), Solicitor. 1 portrait.
Hon. Deidre Jane Frances O'Brien (1924-), Eldest daughter of the 16th Baron Inchiquin; wife of Horace Beecher Chapin. 1 portrait.
Edmund Donough John O'Brien (1858-1945), Brigadier-General. 1 portrait.
Edna O'Brien (circa 1932-), Novelist, short story writer and playwright. 6 portraits.
Hon. Eileen Vivien O'Brien (née de la Poer Beresford) (1912-1975), Daughter of 5th Baron Decies; wife of Robert Alfred O'Brien. 4 portraits.
Eliza Bridgeman O'Brien (née Willyams) (died 1802), Wife of James O'Brien, later 3rd Marquess of Thomond. 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. 1 portrait.
Kate O'Brien (1897-1974), Novelist. 14 portraits.
Kendal Edmund O'Brien (1849-1909), Politician; Farmer. 1 portrait.
Michael O'Brien (1954-), Politician. 2 portraits.
Nelly O'Brien (died 1768), Courtesan. 9 portraits.
Patrick O'Brien (1853-1917), Mechanical and marine engineer; Politician. 3 portraits.
Patrick Joseph O'Brien (1835-1911), Politician; Hotel proprietor and 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 Susan Sarah Louisa O'Brien (née Strangways) (1744-1827), Wife of William O'Brien, actor. 1 portrait.
William O'Brien (died 1815), Actor. 3 portraits.
William O'Brien (1852-1928), Irish nationalist leader and journalist. 5 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. 4 portraits.
Samson Occom (1723?-1792), Missionary to North American Indians. 1 portrait.
Humphrey Ocean (Humphrey Anthony Erdeswick Butler-Bowdon) (1951-), Painter. 1 portrait.
Sir David Ochterlony, 1st Bt (1758-1825), General. 2 portraits.
William Ockham (circa 1287–1347), Philosopher, theologian, and political theorist. 1 portrait.
Daniel O'Connell (1775-1847), Irish politician. 20 portraits.
Arthur O'Connor (1763-1852), Irish rebel. 7 portraits.
Arthur O'Connor (1844-1923), Politician; 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.
Sir (William) Frederick Travers O'Connor (1870-1943), Lieutenant-Colonel. 1 portrait.
Jack O'Connor (1897-1977), Cricket player. 2 portraits.
James O'Connor (1836-1910), Journalist and politician. 2 portraits.
John O'Connor (1850-1928), Politician. 12 portraits.
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. 14 portraits.
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.
Dick O'Dell, Record producer. 1 portrait.
Francesca Odell, Archive and Library Assistant, National Portrait Gallery. 1 portrait.
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. 4 portraits.
George Odger (1813-1877), Shoemaker and trade unionist. 1 portrait.
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; 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-), Writer. 1 portrait.
Freeman M. O'Donoghue, Author. 1 portrait.
William James O'Donovan (died 1955), Dermatologist. 1 portrait.
Sir James O'Dowd (1829-1903), Lawyer. 1 portrait.
Darby O'Driscol. 1 portrait.
Florence O'Driscoll (died 1939), Engineer and journalist. 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.
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.
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. 5 portraits.
Mary O'Flaherty, Fashion model. 1 portrait.
Grand Duchess George of Russia, Foreign dignitary. 1 portrait.
Amalia of Solms-Braunfels (1602-1675), Wife of Frederick Henry, Prince of Orange. 2 portraits.
Samuel Ogden (1716-1778), Divine. 2 portraits.
John Andrew Howard Ogdon (1937-1989), Pianist and composer. 3 portraits.
Sir William Gammie Ogg (1891-1979), Agricultural scientist. 5 portraits.
John Ogilby (1600-1676), Publisher and geographer. 8 portraits.
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.
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. 12 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.
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.
Sir John Oglander (1585-1655), Diarist. 2 portraits.
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 1652/3 - circa 1692), Wit and Gambler. 1 portrait.
Thomas Ogle (floruit 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), Politician. 14 portraits.
Paul O'Grady (1955-), Comedian. 2 portraits.
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.
Brian O'Hara (1942-), Pop musician. 2 portraits.
Charles O'Hara (circa 1740-1802), Army officer and colonial governor. 1 portrait.
Kane O'Hara, Irish playwright. 2 portraits.
Don Bernardo O'Higgins, Revolutionary. 1 portrait.
Yoshiro Ohta (1900-), Japanese tennis player. 3 portraits.
Christine Ohuruogu (1984-), Sprinter. 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. 1 portrait.
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 (1969-), 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 1957-1991. 6 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-), Daughter of 8th Earl of Dunmore; wife of Peter Carlton Oldfield. 1 portrait.
Anne Oldfield (1683-1730), Actress. 5 portraits.
Bruce Oldfield (1950-), Fashion designer. 3 portraits.
Claude Houghton Oldfield (1889-1961), Novelist. 2 portraits.
Nina Oldfield, Actress. 4 portraits.
Alun Bennett Oldfield-Davies (1905-1988), Controller, Welsh BBC. 2 portraits.
George Oldham, Vicar of St Paul's, Walden. 1 portrait.
John Oldham (1653–1683), Poet. 1 portrait.
Nathaniel Oldham (floruit 1728 - circa 1747), Virtuoso; Collector of Curiosities. 1 portrait.
Richard Dixon Oldham (1858-1936), Geologist and seismologist. 1 portrait.
Angelica (née Pergami), Contessa Oldi (floruit 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.
Queen Olga of Greece (1851-1926), Wife of King George I of Greece. 1 portrait.
Olga, Grand Duchess of Russia (1895-1918), Daughter of Nicholas II, Emperor of Russia. 2 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. 2 portraits.
Laurence Oliphant (1829-1888), Diplomatist and traveller. 1 portrait.
Marcus Laurence Elwin Oliphant (1901-2000), Physicist involved in developing the atomic bomb. 2 portraits.
Margaret Oliphant Wilson Oliphant (1828-1897), Novelist. 2 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.
Anthony Oliver (1923-1995), Actor. 1 portrait.
Dame Beryl Oliver (1882-1972), Head of V.A.D. Department. 6 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. 24 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. 1 portrait.
Sir Roland Giffard Oliver (1882-1967), Judge of High Court of Justice. 2 portraits.
Sir Thomas Oliver (1852-1942), Physician and industrial hygienist. 1 portrait.
Vic Oliver (1897-1964), Comedian, actor and musician. 1 portrait.
Mrs Oliver. 1 portrait.
Thomas Olivers (circa 1725-1799), Methodist preacher and hymn writer. 1 portrait.
Laurence Kerr Olivier, Baron Olivier (1907-1989), Actor, producer and director. 80 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 Olliff, Tennis player. 3 portraits.
Alfred Ollivant (1798-1882), Bishop of Llandaff. 2 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.
Pierce Charles de Lacy O'Mahony (née Mahony) (1850-1930), Politician and philanthropist. 1 portrait.
Omai (Mai) (circa 1753-circa 1780), first Tahitian to visit England. 5 portraits.
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. 1 portrait.
William O'Malley (1853-1939), Politician and journalist. 5 portraits.
The Sultan of Oman (Qaboos Bin Said). 1 portrait.
Sir Charles William Chadwick Oman (1860-1946), Conservative MP, Professor of Modern History at Oxford University. 6 portraits.
Kate O'Mara (1939-), Actress. 1 portrait.
Sir Erasmus Ommanney (1814-1904), Admiral. 1 portrait.
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. 7 portraits.
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. 3 portraits.
Sir Con Douglas Walter O'Neill (1912-1988), Foreign Office ambassador. 1 portrait.
Herbert Charles O'Neill (died 1953), Journalist and editor. 1 portrait.
John O'Neill (1778-1858), Shoemaker, poet and author. 1 portrait.
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.
Oliver Onions (1873-1961), Draughtsman for Harmworth Press. 1 portrait.
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. 3 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. 2 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. 3 portraits.
Arthur Onslow (1691-1768), Speaker of the House of Commons. 9 portraits.
Denzil Roberts Onslow (1839-1908), MP for Guildford. 1 portrait.
Frank Herbert Onslow (1899-1970), Son of M.R.S. Onslow. 4 portraits.
George Onslow (1731-1792), Politician. 1 portrait.
Guildford James Hillier Onslow (1814-1882), Politician. 1 portrait.
Hon. Lena Barbara Joan Onslow (née Ogilvie-Grant) (1907-1981), Wife of Frank Herbert Onslow; daughter of Trevor Ogilvie-Grant, 4th Baron Strathspey. 11 portraits.
Sir Richard Onslow, Bt (1741-1817), Admiral. 3 portraits.
Richard Onslow (1527 or 1528-1571), Lawyer; 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. 3 portraits.
Amelia Opie (1769-1853), Novelist and poet; second wife of John Opie. 8 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. 9 portraits.
Julian Opie (1958-), Artist. 1 portrait.
William Alfred Opie (1901-1977), Air Vice-Marshal. 1 portrait.
Duchess of Oporto (née W H Chapman), Wife of Duke of Oporto. 1 portrait.
Julie Opp (Mrs William Faversham) (1871-1921), Actress. 1 portrait.
Lady Bridget Sarah Oppenheim (née Sinclair) (1947-), Wife of Nicholas Anthony Oppenheim; Daughter of 19th Earl of Caithness. 1 portrait.
Sir Duncan Morris Oppenheim (1904-2003), Businessman; Artist and arts administrator. 1 portrait.
Edward Phillips Oppenheim (1866-1946), Novelist. 7 portraits.
Sally Oppenheim-Barnes, Baroness Oppenheim-Barnes (1930-), Administrator and politician. 1 portrait.
(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. 8 portraits.
Alison Opyrchal, Archive Assistant, National Portrait Gallery. 1 portrait.
Edward Oram (floruit 1766-1799), Landscape painter. 1 portrait.
Phillip William, Prince of Orange (1554-1618), Prince of Orange. 1 portrait.
Frederick Henry, Prince of Orange, Count of Nassau (1584-1647), Prince of Orange. 15 portraits.
Sir Hugh William Orange (1866-1956), Educationist. 2 portraits.
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.
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. 9 portraits.
Roy Kelton Orbison (1936-1988), Singer and songwriter. 1 portrait.
Paul Orchard (1739-1812), Politician. 1 portrait.
Robert Orchard, Grocer in Soho. 1 portrait.
William Edwin Orchard (1877-1955), Roman Catholic priest and theologian. 1 portrait.
Sir William Quiller Orchardson (1832-1910), Portrait and subject painter. 15 portraits.
Baroness Orczy (1865-1947), Novelist. 4 portraits.
William Ord (1781-1855), MP. 1 portrait.
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.
Julian Orde (1918-1970s), Daughter of Cuthbert Julian Orde. 4 portraits.
Max O'Rell (1848-1903), Author, traveller and lecturer. 1 portrait.
Robert Walpole, 1st Earl of Orford (1676-1745), Prime Minister. 20 portraits.
Edward Russell, Earl of Orford (1653-1727), Admiral. 10 portraits.
Horatio Walpole, 2nd Earl of Orford (1752-1822). 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. 18 portraits.
Emily Gladys Walpole (née Oakes), Countess of Orford, 2nd wife of Robert Horace, 5th Earl of Orford. 10 portraits.
Horatio Walpole, 1st Earl of Orford (1723-1809). 1 portrait.
Horatio William Walpole, 4th Earl of Orford (1813-1894), Landowner. 1 portrait.
John Foster, 1st Baron Oriel (1740-1828), Speaker of the Irish House of Commons. 1 portrait.
Cait O'Riordan (1965-), Musician; Wife of Elvis Costello. 1 portrait.
George Hamilton, 1st Earl of Orkney (1666-1737), Army officer. 3 portraits.
Mary (O'Brien), Countess of Orkney (1755-1831), Countess in her own right; wife of 1st Marquess of Thomond. 1 portrait.
Charlotte Isabella (née Irby), Countess of Orkney (1807-1883), Wife of 5th Earl of Orkney; Daughter of 3rd Baron Boston. 1 portrait.
Henrietta Anne, Duchess of Orleans (1644-1670), Daughter of Charles I. 13 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. 4 portraits.
Eugene Adelaide Louise d'Orleans (1777-1847). 1 portrait.
Louise Marie Adelaide Eugènie d'Orléans, Sister of Louis Philippe. 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.
Count Serge Orloff-Davidoff, Foreign dignitary; husband of Hon. Elizabeth Scott-Ellis; 2nd daughter of Lord and Lady Howard De Walden. 1 portrait.
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 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.
Frank Leslie Orme (1898-1968), Lieutenant-Colonel; Director, Royal Insurance Co. Lt; 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 (floruit 1688), Soldier; one of the 'Portsmouth Captains' cashiered in 1688. 3 portraits.
Julia Karin Ormond (1965-), Actress. 1 portrait.
Leonée Ormond (née Jasper) (1940-), Art historian. 1 portrait.
Richard Louis Ormond (1939-), Art historian; Former Director of the National Maritime Museum. 3 portraits.
James Butler, 1st Duke of Ormonde (1610-1688), Royalist soldier and statesman. 16 portraits.
James Butler, 2nd Duke of Ormonde (1665-1745), Soldier and Jacobite. 25 portraits.
Mary (Somerset), Duchess of Ormonde (1665-1733), 2nd wife of James Butler, 2nd Duke of Ormonde. 10 portraits.
John Butler, 2nd Marquess of Ormonde (1808-1854). 1 portrait.
James Edward William Theobald Butler, 3rd Marquess of Ormonde (1844-1919), Landowner. 3 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 (floruit 1880s), Actress. 1 portrait.
Frederick Charles O'Rorke (1879-1976), Soldier and Government Veterinary Officer. 3 portraits.
Sir William Orpen (1878-1931), Painter. 20 portraits.
Edward Orpin (died 1781), Parish clerk. 1 portrait.
Alexandra Sutherland Orr (née Leighton) (1828-1903), Sister of Lord Leighton; biographer of Robert Browning. 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-), Composer and Professor of Music. 1 portrait.
Charles Boyle, 4th Earl of Orrery (1674-1731), Soldier and scholar. 2 portraits.
Henrietta (née Hamilton), Countess of Orrery (died 1732), 1si Wife of John Boyle, 5th Earl of Orrery. 1 portrait.
(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. 2 portraits.
Sir Norman Archibald Orr Ewing, 4th Bt (1880-1960), Brigadier-General. 4 portraits.
Doris Blanche Orr (née Lee), Lady Orr-Lewis, Daughter of Charles Lee; married firstly Sir Walter Gibbons; secondly Sir John Duncan Orr-Lewis, 2nd Bt. 3 portraits.
James Orrock (1829-1913), Painter and art collector. 3 portraits.
Count Felice Orsini (1819-1858), Italian revolutionary. 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; creator of the first modern atlas. 1 portrait.
Arthur Orton (1834-1898), The Tichborne claimant. 15 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.
Mrs George Orton, Mother 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 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.
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.
Sir Frederick James Osborn (1885-1978), Town and County Planner. 6 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. 2 portraits.
Sue Osborn, Joint Chief Executive, National Patient Safety Agency. 1 portrait.
Lady Bridget Williams (née Osborne) (born before 1688), Wife of Reverend Williams, Prebendary of Chichester; daughter of Peregrine Osborne, 2nd Duke of Leeds. 2 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 (floruit 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. 2 portraits.
Edmund Archibald Osborne (1885-1969), Lieutenant-General. 2 portraits.
Elsie Gregory Osborne, Miniature painter. 1 portrait.
John (James) Osborne (1929-1994), Playwright, autobiographer and actor. 15 portraits.
Malcolm Osborne (1880-1963), Engraver and teacher. 1 portrait.
Ralph Bernal Osborne (1808-1882), Liberal politician. 1 portrait.
Rosabelle Osborne (died 1958), Matron (Principal) at the War Office 1924, Matron-in-Chief until 1930. 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. 1 portrait.
John Michael ('Ozzy') Osbourne (1948-), Singer and songwriter. 1 portrait.
Oscar II, King of Sweden (1829-1907), Reigned 1872-1907. 1 portrait.
Patrick Joseph O'Shaughnessy (1872-1920), Politician. 2 portraits.
Prudence O'Shea, Performer. 1 portrait.
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.
Elizabeth Sylvia Neville Osmond-Smith (née Moss) (born 1923), Wife of Francis Howard Osmond-Smith; Daughter of Kenneth Neville Moss. 1 portrait.
(John) Evelyn Denison, 1st Viscount Ossington (1800-1873), Speaker of the House of Commons. 9 portraits.
Thomas Butler, Earl of Ossory (1634-1680), Courtier and man of action. 4 portraits.
Emilia Butler, Countess of Ossory (1635-1688), Dutch-Anglo Courtier and wife to Thomas Butler, 6th Earl of Ossory. 3 portraits.
Count Osterman, Russian diplomat. 1 portrait.
Isidore Ostrer (1889-1975), Poet, financier and economist. 27 portraits.
Maureen O'Sullivan (1911-1998), Film actress. 1 portrait.
Ronnie O'Sullivan (1975-), Snooker player. 2 portraits.
Alexander Oswald. 3 portraits.
Oswald Charles Williamson Oswald (1863-1938), Brigadier-General. 2 portraits.
Richard Alexander Oswald (1771-1841), MP for Ayrshire. 1 portrait.
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. 2 portraits.
Peter O'Toole (1932-), Actor. 5 portraits.
Mrs Frank Otter, Australian foreign visitor. 1 portrait.
Bruce Ottley, Chairman of the United Kingdom Gas Corporation. 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. 1 portrait.
Eliza Price (née Noble), Lady Otway (later Mrs Leathem) (died 1910), Widow of Sir George Graham Otway, 2nd Bt and wife of Thomas William Crawford Leathem; Daughter of John Campbell. 6 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. 5 portraits.
Nicholas Oudart (floruit 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. 2 portraits.
Walter William Ouless (1848-1933), Portrait painter. 7 portraits.
Brian Oulton (1908-1992), Actor. 1 portrait.
Thérèse Oulton (1953-), Painter. 2 portraits.
Wilfred Ewart Oulton (1911-), 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. 3 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. 7 portraits.
Joseph Outram (1766-1802), Diplomat and oriental scholar. 1 portrait.
Ernest Carrington Ouvry (1866-1951), Solicitor. 1 portrait.
Horace Ové (1939-), Film-maker and photographer. 1 portrait.
John Overall (1560-1619), Bishop of Norwich. 12 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. 14 portraits.
Sir Arnold Edersheim Overton (1893-1975), Political secretary. 1 portrait.
John Overton (floruit 1665-1707). 1 portrait.
Aida Overton Walker (1880-1914), Actress, dancer and singer. 3 portraits.
Stephen Michael James ('Steve') Ovett (1955-), Middle distance runner. 2 portraits.
Sir Esmond Ovey (1879-1963), Diplomat. 1 portrait.
David Anthony Llewellyn Owen, Baron Owen (1938-), Politician. 6 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.
Dawn Owen, Tennis player. 1 portrait.
Pat Owen. 1 portrait.
Sir Douglas Owen (1850-1920), Barrister. 4 portraits.
Edward Rodney Owen (born 1856), Sportsman. 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 Carnarvonshire; Lieutenant-Colonel. 4 portraits.
Hugh Owen (1784-1861), Soldier in service of Portugal. 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. 7 portraits.
John Owen (1616-1683), Puritan divine. 22 portraits.
John Owen (1766-1822), Divine. 1 portrait.
Sir (William) Leonard Owen (1897-1971), Atomic engineer. 8 portraits.
Leslie Owen (1886-1947), Bishop of Lincoln (from 1946). 1 portrait.
L.G. Owen, Tennis player. 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. 23 portraits.
Robert Owen (1771-1858), Pioneer of practical socialism. 5 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.
Ursula Margaret Owen (née Sachs) (1937-), Co-founder and Managing Director, Virago Books; Editor and Chief Executive, Index on Censorship. 1 portrait.
Wilfred Owen (1893-1918), Poet. 1 portrait.
William James Owen (1901-1981), Politician; Adult education class teacher and lecturer. 2 portraits.
Sir William James Owen (1901-1981), Politician. 1 portrait.
Patricia Owens (1925-2000), Actress. 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; married firstly, Charles Anderson Worsley, 2nd Earl of Yarborough, and secondly, William J. Monson, Viscount Oxenbridge. 1 portrait.
Helen Oxenbury (1935-), Children's books illustrator. 1 portrait.
John Oxenham (died 1941), 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. 2 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. 12 portraits.
Edward Harley, 2nd Earl of Oxford (1689-1741), Patron of letters and collector. 10 portraits.
Herbert Henry Asquith, 1st Earl of Oxford and Asquith (1852-1928), Prime Minister. 50 portraits.
Emma Alice Margaret (Margot), Countess of Oxford and Asquith (1864-1945), Society hostess. 34 portraits.
Julian Edward George Asquith, 2nd Earl of Oxford and Asquith (1916-), Colonial administrator. 2 portraits.
Sir Henry Oxinden (Oxenden) (1609–1670), Gentleman and letter-writer. 2 portraits.
Robert Dickinson Oxland (1889-1959), Air Vice-Marshal. 1 portrait.
Elizabeth Oxley (floruit 1679), Maid to Mr Bird. 1 portrait.
William Oxman (Orsingham) (floruit 1660s), Preacher of the doctrines of the Fifth Monarchy Men. 2 portraits.
R.W. Oxspring, Flight lieutenant. 1 portrait.
Jan Oyra (born 1888), Dancer. 5 portraits.
Rifat Ozbek (1953-), Fashion designer. 2 portraits.
