Francis Thomas Sullivan (Saint Louis, Missouri, 17 de juny de 1908 - Los Angeles, Califòrnia, 17 de desembre de 1975), conegut professionalment com a Frank Sully, va ser un actor de cinema nord-americà. Va aparèixer en més de 240 pel·lícules entre 1934 i 1968. El públic d'avui el coneix com el detectiu mut de les característiques de Boston Blackie i com a protagonista de moltes comèdies de Three Stooges.

Francis Thomas Sullivan, aka Frank Sully, was an American character actor. Beefy and square-jawed, he was usually cast as rustic types or dumb heavies. He was a regular feature in Three Stooges shorts. Sully started his career as a comedian in vaudeville and appeared on Broadway from the late 1920s. He is known for the films The Grapes of Wrath (1940), The More the Merrier (1943) and Bye Bye Birdie (1963).