Lysimachia (Greek: Λυσιμαχία) is a lake in Aetolia-Acarnania, western Greece. Its area is 13.2 km², its depth is around 9 m. It is fed by the small river Ermitsa, and by a canal that connects the lake with the larger Lake Trichonida to its east. Its outflow is the river Dimikos, which drains into the river Acheloos. The city of Agrinio lies 6 km to the northeast.

Lake Lysimachia
Λίμνη Λυσιμαχία (Greek)
Lake Lysimachia
Location	Aetolia-Acarnania
Coordinates	38°33′40″N 21°22′10″E / 38.56111°N 21.36944°E / 38.56111; 21.36944
Type	Natural Lake
Primary inflows	Ermitsa, canal from Lake Trichonida
Primary outflows	Dimikos
Basin countries	Greece
Max. length	5.5 km (3.4 mi)
Max. width	2.5 km (1.6 mi)
Surface area	13.2 km2 (5.1 sq mi)
Max. depth	9 m (30 ft)
Settlements	Agrinio