Trainor is a surname, and may refer to:
- Bernard E. Trainor (born 1928), American Marine Corps general and media military analyst
- James H. Trainor (1935–2003), American physicist and NASA scientist
- Jerry Trainor (born 1977), American film and television actor
- Kendall Trainor (born 1967), American college football player
- Kevin Trainor, Irish actor
- Larry Trainor (1905-1975), American Trotskyist and Socialist Workers Party activist
- Mary Ellen Trainor (born 1950), American actress
- Patrick F. Trainor (1864–1902), New York politician
- Rick Trainor (born 1948), British professor of social history
- Saxon Trainor (born 1969), American television actress
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