| Lac du Portillon | |
| Pushpin Map: | France Haute-Garonne |
| Location: | Pyrénées, Haute-Garonne |
| Coords: | 42.7008°N 0.5089°W |
| Type: | reservoir |
| Basin Countries: | France |
| Area: | 0.34km2 |
| Max-Depth: | 101m (331feet) |
| Elevation: | 2580m (8,470feet) |
Lac du Portillon is a lake in Pyrénées, Haute-Garonne, France. At an elevation of 2580 m, its surface area is 0.34 km².
Perdiguero Peak rises above this lake.