Lake Vistonida (Greek: Λίμνη Βιστωνίδα, older form: Βιστωνίς) is a lake in Porto Lagos, Xanthi regional unit, Greece.

Fed by the Kompsatos river, it encompasses a unique ecosystem and the local climate can be described as mid-Mediterranean.

It hosts a variety of fauna, which comprise several types of fish, amphibians, reptiles, mammals, birds as well as flora.

[1] In Byzantine times, a quarter of its produce is said to have been granted by the emperor Arcadius to the convent of the Vatopedi monastery on Mount Athos.

The river Cossinites emptied itself into the lake Bistonis, which at one time overflowed the neighbouring country and swept away several Thracian towns.