The 2005 season of the Toppserien, the first-tier women's football (soccer) league in Norway, began on 16 April 2005 and ended on 22 October 2005.

18 games were played with 3 points given for wins and 1 for draws.

Number nine and ten were originally relegated, but ninth-placed Liungen survived after Asker was forcibly relegated due to economic license issues.

[1] The two top teams from the First Division were promoted.

Kolbotn won the league.