John Dennis may refer to:

• John Dennis (1771–1806), Maryland congressman
• John Dennis (1807–1859), his son, Maryland congressman
• John Dennis (bishop) (1931–2020), former Bishop of St Edmundsbury and Ipswich
• John Cawsey Dennis (1871–1939), English carmaker, one of the two brothers who founded Dennis Brothers
• John Dennis (diplomat) (born 1959), British diplomat, U.K. Ambassador to Taiwan, and former U.K. Ambassador to Angol
• John Dennis (dramatist) (1658–1734), English dramatist
• John Dennis (Missouri politician) (1917–2000), Missouri politician
• John Dennis (ornithologist) (c. 1916 – 2002), American ornithologist
• John Dennis (talk show host) (born c. 1952), American radio talk show host
• John B. Dennis (1835–1894), American Union Civil War era brevet brigadier general
• John E. Dennis (born 1939), mathematician
• John N. Dennis (born 1933), American politician in the New Jersey General Assembly
• John Stoughton Dennis (1820–1885), Canadian surveyor
• John William Dennis, Member of Parliament for Birmingham Deritend, 1918–1922a

• Dennis Specialist Vehicles or John Dennis Coachbuilders, a British coachbuilder and manufacturer of specialised vehicles

• All pages with titles beginning with John Dennis
• Jack Dennis (born 1931), American electrical engineer and computer scientist
• Jack Dennis (cricketer) (1913–2006), English cricketer
• Jackie Dennis (1942–2020), singer
• John Dennys (died 1609), poet and fisherman

This disambiguation page lists articles associated with the title John Dennis.
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