Paolo Uccello. 1 portrait.

Universum Film A.G. (UFA). 5 portraits.

John Ulbricht (1926-). 1 portrait.

Heinrich Ulrich (circa 1592-circa 1631). 4 portraits.

Leon Underwood (1890-1975). 3 portraits.

W. Underwood. 1 portrait.

Underwood & Underwood (floruit 1900s). 7 portraits.

United Association of Photography Limited (floruit 1865-1867). 13 portraits.

Universal Pictorial Press and Agency Ltd. 2 portraits.

University Magazine. 1 portrait.

Unknown artist with initial H. 1 portrait.

Unknown artist. 6435 portraits.

Unknown artist after unattributed portrait. 1 portrait.

Unknown electrotypist. 1 portrait.

Unknown photographer. 1068 portraits.

Unknown Italian artist. 1 portrait.

Unknown artists. 15 portraits.

Unknown engraver. 392 portraits.

Unknown miniaturist. 8 portraits.

Unknown seventeenth-century miniaturist. 1 portrait.

Unknown printer. 1 portrait.

Unknown sculptor. 11 portraits.

Unknown silhouettist. 4 portraits.

Unknown silversmith. 2 portraits.

Moritz Unna (1811-1871). 1 portrait.

John Urie (1820-1910). 1 portrait.

Urquhart. 2 portraits.

Thomas Uwins (1782-1857). 14 portraits.