Acherontas (Greek: Αχέροντας) is a former municipality in Thesprotia, Epirus, Greece. Since the 2011 local government reform it is part of the municipality Souli, of which it is a municipal unit. The municipal unit has an area of 67.343 km2. It was named after the river Acheron. Population 1,947 (2021). The seat of the municipality was in Gardiki Souli.