Frank Simmons Leavitt (June 30, 1891 – May 29, 1953) was an American professional wrestler of the early 1900s, known by the ring name Man Mountain Dean. Leavitt wrestled with limited success at first, and after an injury took a job as a police officer in Miami, Florida.

Here he met his wife, Doris Dean, who also became his manager. At her suggestion, in 1932 he adopted the nickname "Man Mountain" and substituted the more Anglo-Saxon-sounding last name of Dean. At a stocky 5'11" and weighing over 300 pounds, Dean was an imposing figure.