| Bark Lake | |
| Pushpin Map: | Ontario |
| Location: | Madawaska Valley, Township of South Algonquin |
| Coords: | 45.45°N -127°W |
| Inflow: | Madawaska River, Opeongo River |
| Outflow: | Madawaska River |
| Basin Countries: | Canada |
| Length: | 141NaN1 |
| Width: | 61NaN1 |
| Elevation: | 4500NaN0 |
Bark Lake is a lake on the border between the Township of Madawaska Valley in Renfrew County and the Township of South Algonquin, in Nipissing District in Ontario, Canada. It lies near Madawaska, Ontario, on the Madawaska River where the tributary Opeongo River joins.