The 1990–91 FC Bayern Munich season was the 91st season in the club's history and 26th season since promotion from Regionalliga Süd in 1965. Bayern finished three points behind champions 1. FC Kaiserslautern in the Bundesliga. In the DFB-Pokal, Bayern were eliminated in the first round for the first time in club history. Bayern reached the semifinals of the European Cup before being eliminated by Red Star Belgrade due to an own goal in the 90th minute of the second leg. The first competitive match of the season was the DFB-Supercup on 31 July which Bayern won by a score of 4–1 over 1. FC Kaiserslautern.

Players to transfer to Bayern this summer were: Stefan Effenberg from Borussia Mönchengladbach,Gerald Hillringhaus from SV Türk Gücü München,Brian Laudrup from Bayer 05 Uerdingen,Michael Sternkopf from Karlsruher SC, and Christian Ziege from Hertha Zehlendorf.Rainer Aigner was promoted from Bayern Munich II and Markus Münch was promoted from Bayern Munich Junior Team.Ludwig Kögl left Bayern for VfB Stuttgart,Thomas Kastenmaier left for Borussia Mönchengladbach, and Hans-Dieter Flick left for 1. FC Köln. The Fuji-Cup took place on 24 July and 25 July in Lüdenscheid. The semifinal match against Borussia Dortmund finished as a goalless draw which was decided by a penalty shoot-out with Bayern going to the third place match. The third place match against 1. FC Köln was won by a score of 4–1. Bayern defeated 1. FC Kaiserslautern in the DFB-Supercup on 31 July 4–1.

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