The Pamisos (Greek: Πάμισος) is the largest river of the Messenia regional unit of the southern Peloponnese in Greece. 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.