The club was founded in the 1972 and currently plays in the Illawara Rugby Union competition, after previously competing in the First Division of the NSWSRU.

[1] The Campbelltown Harlequin club was founded in 1972, initially playing with one team in the Sydney Suburban competition.

The club transferred to the Illawarra competition for three seasons from 1974 to 1976, fielding first and second grade teams, and won the premiership in second grade and the Club Championship in 1974.

[2] For the next eleven seasons Campbelltown played in Sydney.

After fourteen seasons, and with an expanded player base, the club went back to Sydney Subbies.