The 1975 Championship of Australia was an Australian rules football tournament held in Adelaide between the 11 October and 13 October 1975.
The championship was contested by the premiers of the VFL, the SANFL, the WAFL and the Tasmanian State Premiership.
All matches were played in Adelaide, South Australia.
The final, played in front of 17,576, was won by North Melbourne by a margin of 76 points, giving North Melbourne its 1st Championship of Australia Title.
This was the last Championship of Australia title to be held before the competition was expanded the following year, under a new format, into the NFL Wills Cup.