Val-de-Chalvagne (, literally Vale of Chalvagne; ) is a commune in the Alpes-de-Haute-Provence department in southeastern France. It was established in 1974 by the merger of the former communes Castellet-Saint-Cassien, Montblanc and Villevieille.
The population data given in the table and graph below for 1968 and earlier refer to the former commune of Castellet-Saint-Cassien.