Philip "Philly" McMahon (born 5 September 1987 in Dublin) is a Gaelic footballer for Dublin and Ballymun Kickhams.
McMahon won the 2008 O'Byrne Cup with Dublin, defeating Longford in the final. He made his Championship debut that year as a sub against Louth. He played Interprovincial Championship Football for Leinster and won 2 Dublin Under 21 Football Championships with Ballymun. He was named on the 2010 GPA Gaelic Team of the Year. He replaced James McCarthy as a sub in the second half of the 2011 All-Ireland Senior Football Championship Final, a game which Dublin won by 1-12 to 1-11 against Kerry.
In November 2012, he was appointed Strength and Conditioning Coach at Shamrock Rovers.