Philip Walsingham Sergeant was a British professional writer on chess and popular historical subjects. He collaborated on the fifth (1933), sixth (1939), and seventh (1946) editions of Modern Chess Openings, an important reference work on the chess openings. He also wrote biographical game collections of Paul Morphy, Rudolf Charousek, and Harry Nelson Pillsbury, and other important books such as A Century of British Chess (1934) and Championship Chess (1938).