Greg Allen

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