John Ennis
John Ennis may refer to:
- John Ennis (actor), American actor and comic
- John Ennis (baseball), American former Major League Baseball right-handed relief pitcher
- John Wellington Ennis, American filmmaker, activist, and blogger
- Sir John Ennis, 1st Baronet, Member of Parliament for Athlone, 1857–1865
- Sir John Ennis, 2nd Baronet, Member of Parliament for Athlone, 1868–1874 and 1880–1884
- John Ennis v. Smith, see List of United States Supreme Court cases, volume 55
- John Ennis, developer of Shippan Point
- John Ennis (artist), American painter
- John Ennis (poet), Irish poet
- J. Matthew Ennis, English pianist and organist