Büllingen (German: [ˈbʏlɪŋən]; French: Bullange [bylɑ̃ʒ] ⓘ) is a municipality of East Belgium, located in the Belgian province of Liège, Wallonia.

[2] In the period 1815–1919 it belonged first to the Kingdom of Prussia and later to the German Empire following the unification of Germany.

In 1920 it was ceded to Belgium under the terms of the Treaty of Versailles as part of the Eupen-Malmedy (East Cantons) area.

The town played a role in the Battle of the Bulge as the Germans attempted to advance through the Ardennes Forest in World War II.

Büllingen post-office opened in December 1863, in the Malmedy county (Kreis) of the Aachen district (Bezirk) in the Rheinland province.