Saint-Martin-d'Ardèche is member of the intercommunality of Rhône aux Gorges de l'Ardèche together with nearby Ardèche communes of Bidon, Bourg-Saint-Andéol, Gras, Larnas, Saint-Montan, Saint-Just, Saint-Marcel-d'Ardèche, Saint-Remèze and Viviers at the very south-eastern end of department.