Châteaudun (French pronunciation: [ʃɑtodœ̃]) is a commune in the Eure-et-Loir department in northern France.

Châteaudun (Latin Castrodunum), which dates from the Gallo-Roman period, was in the middle ages the capital of the County of Dunois.

[3] The streets, which radiate from a central square, have a uniformity due to the reconstruction of the town after fires in 1723 and 1870.

The town has a château, founded in the 10th century,[3] known for being the first on the road to Loire Valley from Paris.

In addition, there are often temporary exhibitions, recent examples including the war of Asia, ancient Egypt and insects.