| Pirihueico Lake Lago Pirihueico | |
| Pushpin Map: | Chile |
| Location: | Panguipulli Commune, Valdivia Province, Los Ríos Region, Chile |
| Coords: | -39.93°N -71.7903°W |
| Type: | Glacial |
| Inflow: | Huahum River |
| Outflow: | Fui River |
| Basin Countries: | Chile, Argentina |
| Area: | 40km2[1] |
| Cities: | Puerto Fuy, Puerto Pirihueico |
Pirihueico Lake (Spanish; Castilian: Lago Pirihueico, pronounced as /es/) is one of Seven Lakes in Panguipulli Commune, southern Chile. The lake is of glacial origin and it is enclosed mountains of the Andes. It is located in a geological fault that includes Panguipulli Lake and Lácar Lake in Argentina. The lake is drained by Fui River. Pirihueico Lake is used as a waterway due to its elonged shape. It is used mostly by vehicles traveling to or from Argentina by the nearby Huahum Pass. For that reason there is a ferry operating between Puerto Fuy and Puerto Pirihueico in the western respectively eastern extreme of the lake.