The Esso Superleague, later known as the Mobil Superleague, was the top level national Australian netball league between 1985 and 1996. The league was Australia's first national netball league. It was organized by the All Australia Netball Association and featured the state league champions from New South Wales, Victoria, South Australia, Queensland and Western Australia plus a team from the Australian Institute of Sport. Between 1990 and 1996, the winners of the league were also awarded the Prime Minister's Cup and this is sometimes used as an alternative name for the competition. Its main sponsors were Esso and Mobil. In 1997 it was replaced by the Commonwealth Bank Trophy.