Châtillon-en-Diois is a commune in the Drôme department in southeastern France.

It is a member of Les Plus Beaux Villages de France (The Most Beautiful Villages of France) Association.

On 1 January 2019, the former commune Treschenu-Creyers was merged into Châtillon-en-Diois.

[3] Population data refer to the commune in its geography as of January 2023.

This Drôme geographical article is a stub.