The 2008–09 2. Bundesliga was the 35th season of the 2. Bundesliga, the second tier of Germany's football league. The season began on 15 August 2008 and ended on 24 May 2009.
Starting with the 2008–09 season, only two teams are promoted automatically. Two-leg relegation playoffs between the third last team of the Bundesliga and the third team of the 2. Bundesliga at the end of the regular season will be reintroduced.
Likewise, instead of formerly four teams only the two bottom teams are relegated to the new 3. Liga automatically. The third last team plays a two-leg playoff against the third team of the third tier over the remaining place in the 2. Bundesliga.
VfL Osnabrück as 16th-placed team had to face third-placed 3. Liga team SC Paderborn 07 for a two-legged playoff. Paderborn won both matches on an aggregated score of 2–0 and thus secured promotion to 2. Bundesliga 2009–10, while Osnabrück were relegated to 3. Liga 2009–10.