William Hooker Gillette (July 24, 1853 - April 29, 1937) was an American actor and dramatist. He was born in Hartford, Connecticut.

Gillette starred in Sherlock Holmes (1916) as Sherlock Holmes.

Some of his plays included Held by the Enemy (1886) and Secret Service (1896), the latter becoming a movie in 1931.

He also wrote the 1883 play Esmeralda together with Frances Hodgson Burnett.

He built Gillette Castle, now Gillette Castle State Park .