Manly United has competed in the NSW Premier League since 2004–05 when they were elevated after winning the Super League Division
but never actually making it into the old NSL.
The club was previously called Manly Warringah Dolphins, but changed its name in 2004 following promotion.
Manly United is considered an important side in the NSWPL, as it is based on a geographic area, rather than founded by a single ethnic group (e.g. Croats, Serbs, Italians) like other ex-NSL clubs.