Jack Ellis (born 4 June 1955 in London) is an English theatre and television actor best known for his portrayal of villainous prison officer Jim Fenner in the TV series Bad Girls. He has also appeared in ITV soap Coronation Street as Bookmaker Harry Mason. He has two children, Theo and Alice. His older brothers are Robin Ellis, also an actor, and the late director Peter Ellis.
Later in 2012 he toured in a new production of Dickens' Great Expectations playing Jaggers. The production opened in the West End of London in February 2013 at the Vaudeville Theatre. In 2014, he starred as Deputy Governor Danforth in the much acclaimed production of The Crucible by Arthur Miller directed by Yael Farber at the Old Vic.