| Umsaskis lake | |
| Coords: | 46.5917°N 91.5°W |
| Outflow: | Allagash River |
| Basin Countries: | United States |
| Pushpin Map: | Maine#USA |
| Pushpin Map Alt: | Location of Umsaskis Lake in Maine, USA. |
Umsaskis Lake is a lake on the Allagash River in the North Maine Woods region of Maine.
It is located in Aroostook County and lies approximately 27miles from the Canada-U.S. border.
The lake is on the Northern Forest Canoe Trail.