Siegburg (i.e. fort on the Sieg river) 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 from the former seat of West German government Bonn and 26 kilometres from Cologne. The population of the city was 39,192 in the 2013 census.