| Lake Gratiot | |
| Location: | Eagle Harbor Township and Grant Township, Keweenaw County, Michigan |
| Coordinates: | 47.3552°N -88.1268°W |
| Outflow: | Little Gratiot River |
| Area: | 1438acres |
| Pushpin Map: | Michigan#USA |
Lake Gratiot is a 1438acres lake in Keweenaw County, Michigan.[1] The lake is surrounded by dense forest of the Keweenaw Peninsula. The bottom is mainly muck and it has a maximum depth of .[2] The lake flows through the Little Gratiot River into Lac La Belle and then into Lake Superior.