Greg Allen or Gregory Allen may refer to:
Greg Allen (American football) (born 1963), American gridiron football running back Greg Allen (baseball) (born 1993), American baseball outfielder Greg Allen (footballer) (born 1967), English footballer who played as a midfielder Greg Allen (rugby league) (1947–2009), Australian rugby league footballer who played in the 1970s
See also
Allen (surname) Gregory Allen Howard (1952–2023), American journalist, playwright and screenwriter