Football in Australia refers to numerous codes which each have major shares of the mainstream sports market, media, broadcasting, professional athletes, financial performance and grassroots participation: Australian rules football, rugby league, rugby union and soccer. There are four pre-eminent professional football competitions played in Australia: the Australian Football League, the National Rugby League, Super Rugby and the A-League (soccer). By most measures, including attendance, television audience and media presence across the most states, Australian football is the most popular nationally. However, in the states of New South Wales and Queensland, rugby football is overall the most watched and receives the most media coverage, especially the Rugby League State of Origin contested between the two states referred to as "Australian sport's greatest rivalry". In recent times, there has been an increase in popularity in Australian football and corresponding decrease in popularity of Rugby union in New South Wales and Queensland. Soccer, while extending its lead in participation rate, particularly in the large cities, and improving its performance at the FIFA World Cup and at the FIFA Women's World Cup, continues to attract the overall lowest attendance, as well as media and public interest, of the four codes.

Australian rules football is the most watched and attended sport and the second most participated code of football in Australia. Since originating in Victoria in 1858 and spreading elsewhere from 1866, it has been played continuously in every Australian state since 1903 plus the two major territories since 1916.