Wayne St John O'Sullivan (born February 25, 1974) is an Irish retired professional footballer.
Since retiring as a player he has worked as a coach.
Born in Cyprus, O'Sullivan played youth football for Swindon Town before making his professional debut with the club.
In 2001, he moved to Australia, where he played in the National Soccer League and A-League, as well as one season in Singapore.
O'Sullivan represented Republic of Ireland at youth level.
O'Sullivan is the current caretaker coach for A-League side Central Coast Mariners.