| Lac des Îles | |
| Location: | Beauce-Sartigan Regional County Municipality, Chaudière-Appalaches, Quebec, Canada |
| Coordinates: | 45.894°N -70.841°W |
| Inflow: | Discharge of "Lac de la Beurrerie" and two streams. |
| Outflow: | Rivière de la Grande Coudée (via the discharge of "Lac des Îles" |
| Frozen: | Frozen generally from mid-December to mid-March |
| Pushpin Map: | Quebec |
| Pushpin Map Caption: | Location in Quebec |
The Lac des Îles (in English: lake of islands), also called Lac Grande Coudée is a lake located near the village of Saint-Hilaire-de-Dorset, in Beauce-Sartigan Regional County Municipality (MRC), in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.
Its area is approximately 2km2, its altitude of . This lake is surrounded by forest.
The discharge from the lake joins the Rivière de la Grande Coudée, near Saint-Martin. The discharge from the lake joins the Rivière de la Grande Coudée, near Saint-Martin, and is a tributary of the Chaudière River, therefore a sub-tributary of St. Lawrence River.[1]
Camping, fishing, kayaking and various outdoor activities are accessible near the lake and its surrounding area in a natural environment.
The toponym "Lac des Îles" was made official on January 31, 1980, at the Commission de toponymie du Québec.[2]