Stuart Antony Alan O'Keefe (born 4 March 1991) is an English professional footballer who plays as a midfielder for Plymouth Argyle, on loan from Premier League club Cardiff City.
He began his career with Ipswich Town, spending six years in the club's youth academy system, but was released as a teenager without making an appearance for the first team. Following his release, O'Keefe joined the academy at Southend United, making his first-team debut for the club in 2008, during a League One match, at the age of 17. In 2010, he completed a move to Championship club Crystal Palace on a free transfer and went on to make over 50 appearances in all competitions for the club during a five-year spell, helping the club gain promotion to the Premier League via the 2013 Championship play-off Final.