Aucelon is located about 45 kilometers southeast of Valence on the Roanne , which borders the municipality in the north. Neighboring municipalities of Aucelon are Pennes-le-Sec in the north, Barnave in the north and northeast, Recoubeau-Jansac in the east and northeast, Montlaur-en-Diois in the east, Poyols in the east and southeast, Jonchères in the southeast, Volvent in the south and southeast, Brette in the south and Pradelle in the west.
