Wangen District is one of the 26 administrative districts in the canton of Bern, Switzerland. Its capital is the municipality of Wangen an der Aare. From 1 January 2010, the district lost its administrative power while being replaced by the Oberaargau administrative district, whose administrative centre is Wangen an der Aare. Since 2010, it remains therefore a fully recognised district under the law and the Constitution (Art.3 al.2) of the Canton of Berne. The district has an area of 129 km² and consists of 23 municipalities.