John Haynes may refer to:
John Haynes (draughtsman) (fl. 1730–1750), British draughtsman and engraver John Haynes (governor) (1594–1653/54), colonial governor of Massachusetts and Connecticut John Haynes (journalist) (1850–1917), Australian journalist and politician John Haynes Jr. (1937–2021), family physician, surgeon and community leader of Northwest Louisiana and Northeast Texas John Carmichael Haynes (1831–1888), Irish-born rancher, judge and public servant in British Columbia John Earl Haynes (born 1944), American historian John Henry Haynes (1849–1910), American traveller, archaeologist, and photographer John Randolph Haynes (1853–1937), California socialist John C. Haynes & Co., American maker of musical instruments (late 19th century) Johnny Haynes (1934–2005), English footballer
See also John Haynes Holmes (1879–1964), American politician John Haines (disambiguation) John Hanes (disambiguation)