Saint-Avit is located in the department of Drôme, Rhône-Alpes, 17 km east of Saint-Vallier (capital of the canton) and 10 km north of Saint-Donat-sur-l'Herbasse . The surrounding communities are dobby, Saint-Martin-d'Août, Bathernay, Chateauneuf-de-Galaure, and Mureils Claveyson.
Saint-Avit is detached from the town of dobbies since November 15, 1869.
Its inhabitants are called St. and St. Avitois Avitoises.