Siegburg is a city in the district of Rhein-Sieg-Kreis in North Rhine-Westphalia, Germany. It is located on the banks of the rivers Sieg and Agger, 10 kilometres (6.2 mi) from the former seat of West German government Bonn and 26 kilometres (16 mi) from Cologne. The population of the city was 39,192 in the 2013 census.

The Rhein-Sieg-Kreis is a Kreis (district) in the south of North Rhine-Westphalia, Germany. Neighboring districts are Rheinisch-Bergischer Kreis, Oberbergischer Kreis, Altenkirchen, Neuwied, Ahrweiler, Euskirchen, Rhein-Erft-Kreis, the urban district of Cologne. The federal city of Bonn is nearly completely surrounded by the district.