7 August 2009 – Defending Bundesliga champions Wolfsburg open the new Bundesliga season with a 2–0 win over Stuttgart.[2] The first 2nd Bundesliga matches of the season are also played.
19 August 2009 – Edmund Becker is sacked as head coach of 2nd Bundesliga sides Karlsruher SC after four-and-a-half years. Reserves coach Markus Kauczinski is appointed as a caretaker.[3] Just a few hours later, Dieter Hecking resigns as Hannover 96 head coach after a series of bad results during the preparation and early season stages. Hecking was in charge of Hannover since September 2006.[4]
30 August 2009 – After acting as an interim coach for two matches, Andreas Bergmann is appointed as head coach for Hannover 96. Bergmann previously led the reserves team of the club.[5]
3 September 2009 – Markus Schupp is appointed as new head coach of Karlsruher SC. Schupp signs a two-year contract with the club.[6]
5 September 2009 – Jürgen Seeberger is sacked as head coach of Alemannia Aachen after 20 months. The club board cites "a situation where we had to act in order to save Alemannia from harm" as a reason.[7] Assistant coach Willi Kronhardt is assigned as a caretaker.
22 September 2009 – Michael Krüger, former national coach of Sudan, is assigned as new head coach of Alemannia Aachen. Krüger signs a two-year contract with the club.[10]
28 September 2009 – Lucien Favre is released from his duties as Hertha BSC coach after a series of bad results. Favre was in charge of the Berlin club since the beginning of the 2007–08 season. Karsten Heine is assigned as a caretaker.
3 October 2009 – Friedhelm Funkel takes the vacant head coaching position at Hertha BSC. Funkel signs a contract for the remainder of the season.[11]
4 October 2009 – Tomas Oral resigns as head coach of FSV Frankfurt after two draws and six losses from the first eight matches of the 2. Bundesliga season.[12] Oral was in charge of the club since the beginning of the 2006–07 season.
10 November 2009 – Hannover 96 goalkeeper, Robert Enke commits suicide. Enke had been suffering from depression.[17] As a mark of respect, the German national team cancels the friendly match against Chile scheduled for four days later.
13 December 2009 – The winter break in the Women's Bundesliga begins.
13 December 2009 – Facing relegation, TuS Koblenz relieves Uwe Rapolder of his duties as head coach. Rapolder had been at Koblenz since 2007.[19]
20 December 2009 – The last matches before the winter break are played in the Bundesliga.
20 December 2009 – By mutual consent, Benno Möhlmann and SpVgg Greuther Fürth go their separate ways, ending Möhlmann's third spell as head coach in Fürth.[20]
21 December 2009 – 2. Bundesliga breaks for winter.
21 December 2009 – Having achieved only three wins and three draws in their first half season since returning to the Bundesliga 1. FC Nürnerg dismiss manager Michael Oenning, under whom they had earned promotion the previous season.[21]
15 January 2010 – The Bundesliga and 2. Bundesliga resume after the winter break.
19 January 2010 – Hannover 96 sack manager Andreas Bergmann. Bergmann had assumed the post only five months earlier after the resignation of Dieter Hecking.[25] Later the same day, Hannover announces that former FC Schalke manager, Mirko Slomka would replace Bergmann.[26] Slomka had played for Hannover during his playing career, and had previously held positions as head coach of the youth team, and assistant coach for 96.
25 January 2010 – Defending German champions VfL Wolfsburg sack manager Armin Veh, after seven consecutive matches without a win. Reserve team manager Lorenz-Günther Köstner is appointed as interim coach.[27]
1 February 2010 – The winter transfer window closes. 44 players joined Bundesliga clubs, while 51 players left the top flight, and 12 players transferred from one bundesliga club to another.[29] The 2. Bundesliga welcomed 42 new players, 37 players left the league, and four transferred internally.[30]
22 February 2010 – After five straight games without a win and only three points clear of the relegation zone, F.C. Hansa Rostock sacks head coach Andreas Zachhuber. Zachhuber had been in charge of the club for just under a year. He is replaced by his assistant Thomas Finck.[31]
11 March 2010 – With their chances of promotion diminishing, Arminia Bielefeld fires head coach Thomas Gerstner. Bielefeld had been Gerstner's first stint as head coach of a professional club. His asstants Frank Eulberg, and Jörg Böhme as well as Arminia sport director Detlev Dammeier take over the post in the interim.[32]
16 March 2010 – Due to licensing irregularities the DFL deducts four points from Arminia Bielefeld.[33]
26 April 2010 – Having won only one of their previous seven Bundesliga matches, Hamburger SV sack manager Bruno Labbadia, and places his assistant Ricardo Moniz in charge.[34] Labbadia had assumed to post at the beginning of the season.
29 April 2010 – In 16th place and facing relegation, VfL Bochum sack manager Heiko Herrlich. The teams U-19 coach, Dariusz Wosz steps in as caretaker for the remainder of the season.[35] Herrlich had replaced Marcel Koller earlier in the season.
Note: The opponent for this date was changed after Egypt could have been, and ultimately was involved in a decision match against Algeria for a spot in the 2010 FIFA World Cup at the same date.[36]
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Deaths
20 August 2009 – Hans Biallas, 90, winger for TuS 48/99 Duisburg. He earned three caps for Germany in 1938 and 1939. Biallas was the last living player with international appearances for Germany before World War II.[39]
^"Slomka übernimmt in Hannover" [Slomka takes over in Hanover] (in German). DFL. 19 January 2010. Archived from the original on 22 January 2010. Retrieved 19 January 2010.
^"HSV beurlaubt Labbadia!" [HSV sacks Labbadia!] (in German). DFL. 26 April 2010. Archived from the original on 29 April 2010. Retrieved 26 April 2010.
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