The 2004–05 Danish 1st Division season was the 60th season of the Danish 1st Division league championship and the 19th consecutive as a second tier competition governed by the Danish Football Association.
The division-champion and runner-up promoted to the 2005–06 Danish Superliga. The teams in the 14th, 15th and 16th places relegated between the 2nd Division east and west, based on location.