Trun () is a commune in the Orne département and the region of Normandy in north-western France.
The commune is made up of the following collection of villages and hamlets, Magny, Le Ménil Girard and Trun. The commune is spread over an area of with a maximum altitude of and minimum of
The commune is part of the area known as Pays d'Auge.
The commune has the River Dives running through it and two streams Guerard & Merdret's Creek.
The 2018 CORINE Land Cover assessment shows the vast majority of the land in the commune, 61% () is Arable land. The rest of the land is Meadows at 28%, Urbanised land at 8% and Heterogeneous agricultural land at 3%.
Aerial photography has revealed the trace of a Gallo-Roman habitat. In the 19th century a Merovingian dynasty necropolis was discovered.