Leon Errol (born Leonce Errol Sims, July 3, 1881 – October 12, 1951) was an Australian comedian and actor in the United States, popular in the first half of the 20th century for his appearances in vaudeville, on Broadway, and in films.

Born in Sydney to Joseph and Elizabeth Sims,[citation needed] Errol studied medicine at the University of Sydney. When he wrote material for, directed, and acted in the university's annual play, his interests changed to entertaining.

Errol made his first film, a comic short subject called Nearly Spliced, in 1916 (it was not released before 1921), for pioneering east-coast producer George Kleine.[citation needed] He left Broadway and went to Hollywood, appearing in Sally (1925). He was third-billed for Samuel Goldwyn's One Heavenly Night in 1931. The box-office for that film was disappointing, but overall Errol made a smooth transition to films in a variety of comedy roles. His comic trademark was a wobbly, unsteady walk, moving as though on rubber legs; this bit served him well in drunk routines.

Errol starred in a long string of two-reel comedy shorts, which began at Columbia Pictures in 1933. He also starred in two pioneering three-strip Technicolor shorts made at Warner Brothers, Service with a Smile (released July 28, 1934) and Good Morning, Eve! (September 22, 1934), the former beating the RKO Radio Pictures release La Cucaracha by five weeks as the first live action, all-Technicolor release.