Saint-Sulpice-de-Mareuil (, literally Saint-Sulpice of Mareuil; Limousin: Sent Soplesàde Maruelh) is a former commune in the Dordogne department in Nouvelle-Aquitaine in southwestern France. On 1 January 2017, it was merged into the new commune Mareuil en Périgord.
The Lizonne forms the commune's northern border.