Auderghem or Oudergem is one of the 19 municipalities of the Brussels-Capital Region, Belgium. Located in the south-eastern part of the region, along the Woluwe valley and at the entrance to the Sonian Forest, it is bordered by Etterbeek, Ixelles, Watermael-Boitsfort, and Woluwe-Saint-Pierre, as well as the Flemish municipalities of Tervuren and Overijse. In common with all of Brussels' municipalities, it is legally bilingual (French–Dutch).

The Sonian Forest or Sonian Wood is a 4,421-hectare (10,920-acre) forest at the south-eastern edge of Brussels, Belgium. It is connected to the Bois de la Cambre/Ter Kamerenbos, an urban public park which enters the city up to 4 kilometres (2.5 mi) from the city centre.