| Big Trout Lake | |
| Location: | Kenora District, Ontario |
| Pushpin Map: | Ontario |
| Coords: | 53.7833°N -90.0072°W |
| Inflow: | Fawn River |
| Outflow: | Fawn River |
| Catchment: | 4350km2 |
| Basin Countries: | Canada |
| Length: | 57km (35miles) |
| Width: | 23km (14miles) |
| Area: | 645.6km2 |
| Elevation: | 211m (692feet) |
| Islands: | Big Island, Post Island |
| Reference: | [1] [2] |
Big Trout Lake is a large lake in Northern Ontario. The Fawn River fills it from the west and drains it from the east.[2] The reserve of the Kitchenuhmaykoosib Inninuwug First Nation, also known as Big Trout Lake, is on Post Island near the northern shore.