| Hornblende Lake | |
| Pushpin Map: | Ontario |
| Location: | Thunder Bay District, Ontario |
| Coords: | 48.9142°N -87.3797°W |
| Inflow: | Whitesand River |
| Outflow: | Whitesand River |
| Basin Countries: | Canada |
| Length: | 1.1km (00.7miles) |
| Width: | 0.4km (00.2miles) |
| Elevation: | 330m (1,080feet) |
Hornblende Lake is a lake in Thunder Bay District, Ontario, Canada. It is about 1100m (3,600feet) long and 400m (1,300feet) wide, and lies at an elevation of 330m (1,080feet). The primary inflow is the Whitesand River flowing downstream from Longcanoe Lake, and the primary outflow is also the Whitesand River, which flows downstream into Lyne Lake.