Jack Dempsey, a professional boxing champion

Jack Dempsey vs. Tommy Gibbons, a second important boxing match.

Jack Dempsey (wrestler), a champion British professional wrestler.

Jack Dempsey vs. Luis Ángel Firpo, an important boxing match.

Jack Dempsey (fish), a type of fish found in waters off of Mexico and Central America.

Jack Dempsey's Broadway Restaurant, a New York City restaurant owned by the boxer.

Jack Dempsey (politician), an Autralian political leader.