The 2004 AFL season was the 108th season of the Australian Football League (AFL), the highest level senior Australian rules football competition in Australia, which was known as the Victorian Football League until 1989. The season featured sixteen clubs, ran from 26 March until 25 September, and comprised a 22-game home-and-away season followed by a finals series featuring the top eight clubs. The premiership was won by the Port Adelaide Football Club for the first time, after it defeated Brisbane Lions by 40 points in the 2004 AFL Grand Final.