| Thayer Lake | |
| Location: | Keweenaw County, Michigan |
| Coords: | 47.2882°N -88.2667°W |
| Type: | Lake |
| Inflow: | Camp Creek and Finn's Creek |
| Outflow: | Tobacco River (Keweenaw County, Michigan) |
| Basin Countries: | United States |
| Area: | 116acres |
| Max-Depth: | 10feet |
| Elevation: | 761feet |
| Pushpin Map: | Michigan#USA |
| Pushpin Map Alt: | Location of the lake in Michigan. |
Thayer Lake also known as Thayer's Lake or Finn's Lake is a lake in Keweenaw County, Michigan in the United States.
The lake's official name is attested to as far back as 1897.[1]