| Namefr: | Auderghem |
| Namenl: | Oudergem |
| Picture-Legend: | Château Sainte-Anne |
| Map: | Auderghem Brussels-Capital Belgium Map.svg |
| Map-Legend: | Auderghem municipality in the Brussels-Capital Region |
| Arms: | Blason Auderghem.svg |
| Flag: | Oudergem_Belgium.svg |
| Flag Link: | Symbols of Brussels#Municipalities |
| Arms Link: | Symbols of Brussels#Municipalities |
| Community: | |
| Arrondissement: | Brussels-Capital |
| Nis: | 21002 |
| Mayor: | Sophie de Vos |
| Majority: | LB (DéFI), Ecolo-Groen |
| Postal-Codes: | 1160 |
| Telephone-Area: | 02 |
| Web: | www.auderghem.be www.oudergem.be |
| Coordinates: | 50.8167°N 4.4261°W |
Auderghem (in French odœʁɡɛm/; also archaic Dutch) or Oudergem (in Dutch; Flemish ˈʌudərɣɛm/) 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).
Despite large roads slicing through and the increasing traffic, the municipality has an environmental advantage, and it has been able to preserve a relatively important part of its natural and historic legacy: the creeks, the Red Cloister Abbey and its art centre, the Priory of Val-Duchesse, the Château of Three Fountains, the Château Saint-Anne, and St. Anne's Chapel.
Three forest villages (Auderghem, Watermael, and Boitsfort-Bosvoorde), were one for centuries. In 1794, the soldiers of the French Revolution decided to separate these into three distinct municipalities. In 1811, Napoleon decided to reunite the three villages, by imperial decree, into a single administrative entity. But Auderghem was withdrawn from this union by royal act, leaving Watermael-Boitsfort on its own. Thus, Auderghem became an independent municipality in 1863, with only 1,600 inhabitants.
With the construction of the rail line linking Brussels and Tervuren as well as, in 1910, the construction of the French: Boulevard du Souverain|italic=no/Dutch; Flemish: Vorstlaan|italic=no, modernisation came to the municipality and the population grew quickly. In 1956, Paul Henri Spaak lead the Intergovernmental Conference on the Common Market and Euratom at the Château of Val-Duchesse in Auderghem, which prepared the Treaties of Rome in 1957 and the foundation of the European Economic Community and Euratom in 1958.
, the majority of Brussels' Japanese expatriate population lives in Auderghem.
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