2003–04 Danish 1st Division

The 2003–04 Danish 1st Division season was the 59th season of the Danish 1st Division league championship and the 18th consecutive as a second tier competition governed by the Danish Football Association.

The division-champion and runner-up promoted to the 2004–05 Danish Superliga. The teams in the 14th, 15th and 16th relegated to the 2004–05 Danish 2nd Division.