Wayne St John O'Sullivan (born 25 February 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 was part of the regular first eleven for Plymouth Argyle. At the time Plymouth were placed low in the Nationwide Division 3 (now Football League Two), he along with Paul McGregor and Martin Phillips were considered the most consistent players at the time. But in the summer of 2000 he headed to Australia to continue his playing career.
Following the demise of the old National Soccer League competition and the creation of the A-League, O'Sullivan signed with Central Coast Mariners in late 2004 to play in the newly formed A-League.[1] At the club, he was a favourite among fans for his tenacity and energy on the field. After an inconsistent 2006–07 season with The Mariners, during which he was often deployed as a right-back, instead of his preferred right-midfield position, the hard-working midfielder/defender was released.
Although there is some controversy surrounding Lawrie McKinna's decision to release O'Sullivan, it was believed by many in the Mariners camp that he was past his best and for the club to continue to grow in a developing league, his release was necessary.
After being released by Central Coast Mariners, O'Sullivan had spent months trying to find a spot in another football team to continue his playing career, but was not successful.
On Thursday, 21 November 2013, O'Sullivan was named Assistant Coach for the Central Coast Mariners on a contract until the end of the 2014–15 A-League season, working alongside newly appointed coach Phil Moss.
Following the immediate departure of Central Coast Mariner's Head Coach Paul Okon, O'Sullivan was named as the caretaker coach until the end of the 2017–18 A-League season.[4]