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