The Affiliated States Championship is an annual rugby league competition run by the Australian Rugby League involving the five affiliated states (Victoria, South Australia, Northern Territory, Tasmania and Western Australia) plus the Australian Federal Police and Australian Defence Force.

Following the Championship, a Combined Affiliated States (CAS) representative side is selected from the teams to tour the Pacific islands.

The initial Championship had Australian Capital Territory and Newcastle in it because they were the two strongest competitions outside of the Queensland Rugby League and New South Wales Rugby League.

2016 saw the championships return to Adelaide, and were played at Thebarton Oval in Torrensville, with Western Australia winning their seventh consecutive title.

South Australia and Tasmania field a joint team as the least developed rugby league states.