| Official Name: | Aarwangen District |
| Native Name: | Amtsbezirk Aarwangen |
| Settlement Type: | District |
| Subdivision Type3: | Capital |
| Area Total Km2: | 154 |
| Population As Of: | 2007 |
| Population Total: | 41526 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Blank Name Sec1: | Municipalities |
| Blank Info Sec1: | 24 |
Aarwangen District is a constitutional district in the northeast corner of the canton of Bern in Switzerland, with its seat at Aarwangen. From 1 January 2010, the district lost its administrative power. Since 2010, it remains a fully recognised district under the law and the Constitution (Art.3 al.2) of the Canton of Berne. Its municipalities became part of the administrative region Emmental-Oberaargau.
It is surrounded by the canton of Solothurn on the north, the canton of Aargau on the northeast, the canton of Lucerne on the east, the district of Trachselwald on the south, the district of Burgdorf on the southwest, and the district of Wangen on the west.
The district includes the following 25 municipalities and has an area of 154km²: