John Buchanan
John Buchanan is the name of the following people:
- John Buchanan (botanist) (1819–1898), New Zealand botanist and artist
- John Buchanan (sailor) (1884–1943), Scottish sailor
- John Buchanan (politician) (born 1931), Canadian politician (PC)
- John Buchanan (manager) (1943-2015), New Zealand manager
- John Buchanan (producer) , film producer
- John Buchanan (actor) (born 1972), American actor
- John Buchanan (Judoka) (* 1975), British judoka
- John A. Buchanan (1843–1921), American politician
- John Hall Buchanan, Jr. (1928–2018), American politician
- John P. Buchanan (1847–1930), American politician
