| Fourth Lake | |
| Pushpin Map: | Vancouver Island |
| Location: | Vancouver Island, British Columbia |
| Coords: | 49.0667°N -124.4167°W |
| Lake Type: | Natural lake |
| Basin Countries: | Canada |
Fourth Lake is a lake located on Vancouver Island at the expansion of Sadie Creek south of the Nanaimo River.[1] It is one of the Nanaimo Lakes.