If You Knew Susie is a 1948 American comedy film directed by Gordon Douglas and written by Warren Wilson, Oscar Brodney, Bud Pearson and Lester A. White. The film was produced by and starred Eddie Cantor in his final feature film. The film also stars Joan Davis, Allyn Joslyn, Charles Dingle and Bobby Driscoll. The film was released on February 7, 1948, by RKO Pictures.