- Source: John McMartin (disambiguation)
John McMartin (1929–2016) was an American stage, film and television actor.
John McMartin may also refer to:
John McMartin (Canadian politician) (1858–1918), businessman, mining executive and legislator in Ontario
John McMartin (rugby league) (1944–2018), Australian hooker from New South Wales during 1960s and 1970s