Regensburg (also Ratisbon, Latin Ratisbona) is a city (population 129,175 in 2005) in Bavaria, south-east Germany, located at the confluence of the Danube and Regen rivers, at the northernmost bend in the Danube. To the east lies the Bavarian Forest. Regensburg is the capital of the Bavarian administrative region Upper Palatinate.

Regensburg is a district in Bavaria, Germany. It is bounded by (from the north and clockwise) the districts of Schwandorf, Cham, Straubing-Bogen, Kelheim and Neumarkt. The city of Regensburg is enclosed by, but does not belong to the district; it is nonetheless its administrative seat.

See Berthold of Regensburg