The 2008–09 Borussia Mönchengladbach season was the 108th season in the club's history. They played in the Bundesliga, the top tier of German football. It was the club's first season in the top tier since their relegation from the Bundesliga in 2007.
They also took part in the DFB Pokal, Germany's top club knockout competition, where they reached the second round before being eliminated 2–0 by fellow Bundesliga side Energie Cottbus, who they coincidentally played a part in relegating later on in the season.
At the start of the season, Mönchengladbach encountered troubles in the Bundesliga, with several disappointing performances. The worst of it came in a 5–1 defeat to 12th place Hannover 96, saw managerJos Luhukay dismissed in October with only 1 win in 7 league matches, and elimination from the DFB-Pokal by Energie Cottbus. Christian Ziege's brief one match stint as manager saw Borussia get their 4th point of the season in a 2–2 draw to Bochum away, with Hans Meyer taking the reins for the rest of the season.
^ abColautti was born in Córdoba, Argentina, but he soon obtained Israeli citizenship through his Israeli wife, allowing him the option of playing for Israel. He made his international debut for Israel in September 2006.
^ abNeuville was born in Locarno, Switzerland, but he had the option of playing for Germany through his German father. He represented Germany at senior level, making his international debut in September 1998.
^ abMatmour was born in Strasbourg, France, but he had the option of playing for Algeria through his Algerian parents. He represented Algeria at senior level, making his international debut in February 2007.
^Ndjeng was born in Bonn, Germany, but he had the option of playing for Cameroon through his Cameroonian father. He made his international debut for Cameroon in May 2008.
^If two or more players have the same number of goals, they are ranked by appearances, and if the same happens for appearances, they are ranked by minutes played.