Rainer Widmayer is a former German footballer and manager. During his active career, he played mostly in the lower divisions, except his final season, during which he played in the 2. Bundesliga for SSV Ulm. As manager, he has been assistant manager of Swiss clubs FC St. Gallen and Grasshopper Club Zürich. In Germany, he assistant managed Hertha BSC and the reserves and professional squad of VfB Stuttgart. After Markus Babbel was sacked as manager of Hertha BSC, Widmayer was appointed caretaker of the Berlin club. Several days later, having completed his duties of caretaker, Widmayer left Hertha altogether. In 2012 Widmayer was Assistant coach of Markus Babbel as TSG Hoffenheim.
|Full name||Rainer Widmayer|
|Date of birth||2 April 1967|
|Place of birth||Sindelfingen, West Germany|
|Height||1.83 m (6 ft 0 in)|
|–1993||1. FC Pforzheim|
|1995–1997||SpVgg 07 Ludwigsburg||62||(6)|
|1997–1999||SSV Ulm 1846||50||(1)|
|2000–2005||VfB Stuttgart II (Assistant Manager)|
|2001||VfB Stuttgart II (Caretaker)|
|2006–2007||Grasshopper Club Zürich (Assistant Manager)|
|2007–2008||FC St. Gallen (Assistant Manager)|
|2008–2009||VfB Stuttgart (Assistant Manager)|
|2010–2011||Hertha BSC (Assistant Manager)|
|2011||Hertha BSC (Caretaker)|
|2012||TSG 1899 Hoffenheim (Assistant Manager)|
|* Senior club appearances and goals counted for the domestic league only|
- "Hertha BSC stellt Cheftrainer Markus Babbel frei" [Hertha BSC releases manager Markus Babel] (in German). DFL. 18 December 2011. Retrieved 18 December 2011.
- "Skibbe voller Tatendrang" [Skibbe full of zest] (in German). DFL. 22 December 2011. Retrieved 22 December 2011.
- "Freistellung Hoffenheim" [exemption Hoffenheim] (in German). TSG Hoffenheim. 22 December 2011. Retrieved 2 December 2012.