John Vivian (or John Vyvyan) may refer to:
Politicians John Vivian (died 1691), MP for Mitchell John Vivian (died 1577), MP for Helston John Charles Vivian (1887–1964), United States attorney, journalist, governor of Colorado John Vivian (Liberal politician) (1818–1879), English Liberal politician John Henry Vivian (1785–1855), Welsh industrialist and politician of Cornish extraction John Ennis Vivian, British member of parliament for Truro
Others John Vivian (historian) (died 1771), Regius Professor of Modern History at Oxford, 1768–1771 John Vivian (1750–1826), Welsh industrialist of Cornish extraction John Vivian, 4th Baron Swansea (1925–2005), British peer, sports shooter and lobbyist John Lambrick Vivian (1830–1896), genealogist and historian Jack Vivian (1941–2021), Canadian ice hockey player and coach, and college football player John Vivyan (1915–1983), American stage and television actor John Vyvyan (1908–1975), writer on animal rights Johnny Vyvyan (John Vyvyan, 1924–1984), Australian-born actor, appeared in Hancock's Half Hour and other British series
See also John Vivian Dacie (1912–2005), British haematologist