Mareuil en Périgord is a commune in the department of Dordogne, southwestern France. The municipality was established on 1 January 2017 by the merger of former communes Mareuil, Beaussac, Champeaux-et-la-Chapelle-Pommier, Les Graulges, Léguillac-de-Cercles, Monsec, Puyrenier, Saint-Sulpice-de-Mareuil and Vieux-Mareuil.