Gerald Hamer (16 November 1886 – 6 July 1972) was a British actor, born at Llandudno, Wales as Geoffrey Earl Watton to John Watton and Evelyn Clara (née Earl).

Hamer worked in the United States, where he played primarily British characters in Hollywood films. He made a number of appearances in the Basil Rathbone series of Sherlock Holmes films in a variety of different roles.