Dystos (Greek: Δύστος [ˈðistos]; Latin: Dystus) is the name of a lake, village and former municipality in Euboea, Greece.

Since the 2011 local government reform it is part of the municipality Kymi-Aliveri, of which it is a municipal unit.

The ancient town Dystus was mentioned by the 4th century BCE historian Theopompus.

During the 1950s, the power corporation of Greece established a steam power plant close to the lake Dystos at the city of Aliveri.

That power plant used lake water for the cooling system.