| Nicholls Lake | |
| Pushpin Map: | Ontario |
| Location: | Thunder Bay District, Ontario |
| Coords: | 50.4189°N -88.7844°W |
| Inflow: | Whitesand River |
| Outflow: | Whitesand River |
| Basin Countries: | Canada |
| Length: | 1.9km (01.2miles) |
| Width: | 0.4km (00.2miles) |
| Elevation: | 318m (1,043feet) |
Nicholls Lake is a lake in Thunder Bay District, Ontario, Canada. It is 1.9km (01.2miles) long and 0.4km (00.2miles) wide. The lake lies on the Whitesand River at an elevation of 318m (1,043feet) between Selassie Lake upstream and the mouth of Blackett Creek downstream, and about 21km (13miles) northeast of the community of Armstrong.