John Abbott (1821–1893) was Prime Minister of Canada, 1891–1892.
John Abbott or Abbot may also refer to:
- John Abbot (poet) (1587/8–c. 1650), English Roman Catholic cleric and poet
- John Abbot (entomologist) (1751–1840/1), American entomologist and ornithologist
- John Abbott (Newfoundland politician) (1874–1947), Newfoundland politician
- John Abbott (actor) (1905–1996), stage name of John Kefford, British character actor
- John Abbott, a pen-name of author Evan Hunter (1926–2005)
- John Abbott (1937–2011), art dealer of Abbott and Holder
- John Abbott (rugby league) (born 1953), Australian rugby league footballer
- John Abbott (St. John's, Newfoundland and Labrador politician), Newfoundland and Labrador provincial politician
- John Farr Abbott (1756–1794), British barrister
- John White Abbott (1763–1851), English painter and surgeon
- John Lovejoy Abbot (1783–1814), American cleric and librarian
- John Stevens Cabot Abbott (1805–1877), American author
- John T. Abbott (1850–1914), United States Ambassador to Colombia, 1889–1893
- John Beach Abbott (1854–1935), judge and politician in New York
- John Thomas Abbott (1872–1949), English socialist activist