Bassae is an archaeological site in Oichalia, a municipality in the northeastern part of Messenia, Greece. In classical antiquity, it was part of Arcadia. Bassae lies near the village of Skliros, northeast of Figaleia, south of Andritsaina and west of Megalopolis. It is famous for the well-preserved mid- to late-5th century BC Temple of Apollo Epicurius.
Although this temple is geographically remote from major polities of ancient Greece, it is one of the most studied ancient Greek temples because of its multitude of unusual features. Bassae was the first Greek site to be inscribed on the World Heritage List. Its construction is placed between 450 BC and 400 BC.