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.