Frank Cellier (23 February 1884 – 27 September 1948) was an English actor. Early in his career, he toured in Britain, Germany, the West Indies, America and South Africa. In the 1920s, he became known in the West End for Shakespearean character roles, among others, and also directed some plays in which he acted. Later, during the 1930s and 1940s, he also appeared in films. Beginning in the 1930s, Cellier played roles in films, including Sheriff Watson in Alfred Hitchcock's The 39 Steps (1935). He was also Monsieur Barsac in the comedy film The Guv'nor (1935). Cellier died in London in 1948 aged 64.