James Dempsey may refer to:
James Dempsey (Scottish politician) (1917–1982) James Shannon Dempsey (1887–1955), Canadian politician in the Legislative Assembly of Ontario James Dempsey (poker player), English professional gambler James Dempsey (builder) (1768–1838), Australian pioneer James Dempsey (hurler) (born 1989), Irish hurler James C. Dempsey, United States Navy submarine commander