| Big Mink Lake | |
| Pushpin Map: | Ontario |
| Location: | Hastings Highlands, Hastings County |
| Coords: | 45.2525°N -78.0781°W |
| Inflow: | Mink Creek; seven unnamed creeks |
| Outflow: | Mink Creek |
| Basin Countries: | Canada |
| Length: | 7.2km (04.5miles) |
| Width: | 0.7km (00.4miles) |
| Area: | 1.96km2 |
| Max-Depth: | 24m (79feet) |
| Elevation: | 402m (1,319feet) |
| Frozen: | December–April |
Big Mink Lake is a fresh water lake in the St. Lawrence River drainage basin in Hastings Highlands, Hastings County, Ontario, Canada. It is about 5km (03miles) west of the community of Lake St. Peter on Highway 127 and 25km (16miles) northwest of Bancroft.
Big Mink Lake is a long narrow lake punctuated by several narrows and with a forked north end. Card Bay forms the northwest arm of the fork, and the three narrows from north to south are First Narrows, Red Pine Narrows and Crooked Narrows. The lake is about 7.2km (04.5miles) long and 0.7km (00.4miles) wide and lies at an elevation of 402m (1,319feet). The primary inflow is Mink Creek from Upper Mink Lakes at the northeast. There are seven unnamed creeks as secondary inflows: at the northeast, east from Sud Lake, southeast, south, southwest, west, and northwest. The primary outflow, controlled by the Mink Lake Dam, is also Mink Creek, southwest to Moffat Pond, which eventually flows via the York River, Madawaska River and Ottawa River to the St. Lawrence River.