Trainor is a surname of Irish origin derived from the surname McTraynor.
Bernard E. Trainor (born 1928), American journalist and former U.S. Marine Corps officer
Bobby Trainor (born 1934), Northern Irish former association footballer
Charles St. Clair Trainor (1901–1978), Canadian lawyer, judge, and politician
Conor Trainor (born 1989), Canadian rugby union player
Danny Trainor (1944–1974), Northern Irish association footballer
David Owen Trainor, American television director
James H. Trainor (1935–2003), American physicist
Jerry Trainor (born 1977), American actor, comedian, and musician
Jordan Trainor (born 1996), New Zealand rugby union player
Kendall Trainor (born 1967), American former football player
Kevin Trainor, Irish actor
Larry Trainor (1905–1975), American political activist
Luke Trainor (1900–1973), Australian rules footballer
Martyn Trainor (born 1944), South African former officer in the South African Navy
Mary Ellen Trainor (1952–2015), American actress
Meghan Trainor (born 1993), American singer-songwriter and record producer
Mike Trainor (born 1981), American stand-up comedian and writer
Nicholas Trainor (born 1975), English former cricketer
Owen Trainor (1894–1956), Canadian politician and Member of Parliament
Patrick F. Trainor (1863–1902), American politician
Rick Trainor (born 1948), American-British academic administrator and historian
Saxon Trainor (born 1969), American actress and acting coach
Wes Trainor (1921–1991), Canadian ice hockey player
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