John Conlan may refer to:
- Jocko Conlan (1899–1989), Hall of Fame baseball umpire
- John Bertrand Conlan (1930–2021), U.S. Representative from Arizona; son of Jocko Conlan
- John Conlan (Kildare politician), Irish Farmers' Party politician, represented Kildare in the 1920s
- John Conlan (Monaghan politician) (1928–2004), Irish Fine Gael politician
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