John Dennis may refer to:

• John Dennis (dramatist) (1657-1734), English dramatist
• John Stoughton Dennis, Canadian surveyor
• John E. Dennis, mathematician
• John Dennis (talk show host), talk show host
• John Dennis (1771-1806), Maryland Congressman
• John Dennis (1807-1859), Maryland Congressman, and son of John Dennis (1771-1806)
• John Dennis (bishop), former Bishop of St Edmundsbury & Ipswich
• Jack Dennis, American electrical engineer ad computer scientist

This disambiguation page lists articles associated with the same personal name. If an article link led you here, you may wish to change the link to point directly to the intended article.