John Grant (December 27, 1891 – November 19, 1955) was a burlesque producer of the 1930s. In 1938 Abbott and Costello joined the Kate Smith radio program and their sketch Who's on First? was performed for a live audience in March 1938. Before the sketch was performed live it was polished up by Grant, who was later asked to join the comedy duo's writing team helping them with other sketches in the future.
Grant wrote on many of the most memorable movies from Abbott and Costello. He also wrote for the Colgate Comedy Hour as well as authoring many screenplays.