The 2004–05 Slovak First Football League (known as the Slovak Corgoň Liga for sponsorship reasons) was the 12th season of first-tier football league in Slovakia, since its establishment in 1993.

It began on 24 July 2004 and ended on 15 June 2005.

[1] MŠK Žilina were the defending champions.

A total of 10 teams was contested in the league, including 9 sides from the 2003–04 season and one promoted from the 2.

The one relegated team were replaced by FC Rimavská Sobota.