| L'Assomption Lake | |
|---|---|
| Lac l'Assomption (French) | |
 View of Lake L'Assomption | |
  L'Assomption Lake | |
| Coordinates | 46°27′40″N 74°03′08″W / 46.460978°N 74.052084°W |
| Primary outflows | L'Assomption River |
| Surface elevation | 300 metres (980 ft) |
L'Assomption Lake (in French: Lac de l'Assomption) is a lake located in the Mont-Tremblant National Park (sector of L'Assomption), in the Municipality of Saint-Guillaume-Nord, in Matawinie Regional County Municipality, in the administrative region of Lanaudière, in Quebec, in Canada.