McMartin is a surname. Notable people with the surname include:
Alexander McMartin (1788–1853), Canadian politician Barbara McMartin (1931–2005), Adirondack author and environmentalist Duncan McMartin Jr. (1776–1837), New York politician Grant McMartin (born 1970), Scottish footballer Jeff McMartin (born 1967), American football and track and field coach John McMartin (disambiguation), various people Mal McMartin (born 1944), Australian rugby league footballer Peter McMartin (1805–?), Mayor of Jersey City William H. R. McMartin (1854–1945), Canadian-born American politician
See also The McMartin preschool trial, high-profile trial on child sexual abuse