The 1998–99 Deutsche Eishockey Liga season was the 5th season of the Deutsche Eishockey Liga (German Ice Hockey League).

Adler Mannheim continued their dominance in German ice-hockey and became the DEL Champion for the third time in row, winning a German title for the fourth time in their history.

The league had only 14 teams, as the Kaufbeurer Adler and Düsseldorfer EG were forced out due to financial reasons.

The regular season best placed team left played against the worst, and the second best vs. third best.

With the last game, Adler Mannheim continued their dominance in German ice-hockey and became the DEL Champion for the third time in row, winning a German title for the fourth time in their history.