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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