The Rugby-Bundesliga 2008-09 was the 38th edition of this competition and the 89th edition of the German rugby union championship. Nine teams play a home-and-away season with a finals round between the top four teams at the end. The bottom two teams determine which club is relegated in an end-of-season decider. The season started on 30 August 2008 and finished with the championship final on 23 May 2009, interrupted by a winter break from early December to late February. The competition was won by the SC Frankfurt 1880 the previous season.