William Pettigrew Gibson (3 January 1902 - 22 April 1960) was a Scottish-born art historian and art gallery curator. He worked as Assistant Keeper of the Wallace Collection, London, from 1927, was Reader in the History of Art at the University of London and Deputy Director of the Courtauld Institute of Art from 1936, and Keeper of the National Gallery from 1939 to 1960.