| Lake Lysimachia | |
| Location: | Aetolia-Acarnania |
| Coords: | 38.5611°N 21.3694°W |
| Type: | Natural Lake |
| Inflow: | Ermitsa, canal from Lake Trichonida |
| Outflow: | Dimikos |
| Basin Countries: | Greece |
| Length: | 5.5km (03.4miles) |
| Width: | 2.5km (01.6miles) |
| Area: | 13.2km2 |
| Max-Depth: | 9m (30feet) |
| Cities: | Agrinio |
| Pushpin Map: | Greece |
| Pushpin Map Alt: | Location of Lake Lysimachia in Greece. |
Lysimachia (Greek, Modern (1453-);: 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.