The Pamisos (Greek: Πάμισος, Latin: Pamisus) is the largest river of the Messenia regional unit of the southern Peloponnese in Greece. It is 44 km (27 mi) long, and its drainage area is 568 km (219 sq mi). Its source is on the western slopes of the Taygetus mountains, near the village Agios Floros. It runs through the municipal units of Arfara, Ithomi, Androusa, Aris, Messini, Thouria and Kalamata. It flows into the Messenian Gulf east of Messini and west of Kalamata.