Thun District is one of the 26 administrative districts in the canton of Bern, Switzerland. Its capital is the municipality of Thun.
From 1 January 2010, the district lost its administrative power while being replaced by the new and enlarged Thun (administrative district), whose administrative centre remained Thun.
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 285 km2 and consists of 27 municipalities:
46°45′00″N 7°37′00″E / 46.75°N 7.61667°E / 46.75; 7.61667