The 2003–04 Deutsche Eishockey Liga season was the 10th season since the founding of the Deutsche Eishockey Liga (German Ice Hockey League).

The Frankfurt Lions became German Champions, and the Wölfe Freiburg (Freiburg Wolves) were relegated back to the 2.

A visible change for the fans was the league corporate sponsorship by the German Yellow Pages (Gelbe Seiten) who signed a 3-year agreement, later extended ending 2009.

The two lowest placed teams Hannover Scorpions and Wölfe Freiburg played a Best-of-seven series play-down starting March 10, 2004.

The Wölfe Freiburg had to leave the DEL after only one season, returning to the 2.