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- Malcolm Allen (footballer) (born 1967), Welsh footballer
- Malcolm Allen (swimmer) (born 1973), Australian swimmer
- Marcus Allen (born 1960), former American footballer
- Marcus Allen (born 1981), stage name of adult film actor Timothy J, Boham
- Margaret Allen, pseudonym of American science fiction novelist William Thomas Quick
- Martin Allen (footballer) (born 1965), English footballer
- Mary Allen (born 1951), British writer
- Mel Allen (1913–1996), American sportscaster
- Michael Allen, several people
- Mike Allen (broadcaster) (born 1942), British radio broadcaster
- Mike Allen (poet) (born 1969), American writer and poet
- Myron Allen (1854–1924), American baseball player
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