| MacFarlane River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the MacFarlane River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northwestern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Kenora |
| Subdivision Type5: | Part |
| Subdivision Name5: | Kenora, Unorganized |
| Source1: | Rocky Lake |
| Source1 Coordinates: | 50.0139°N -94.2711°W |
| Source1 Elevation: | 345m (1,132feet) |
| Mouth: | Winnipeg River |
| Mouth Coordinates: | 49.9356°N -94.5564°W |
| Mouth Elevation: | 315m (1,033feet) |
| River System: | Hudson Bay drainage basin |
The MacFarlane River is a river in Unorganized Kenora District in northwestern Ontario, Canada and a tributary of the Winnipeg River.Locally it has been called the "Black River", a reference to the dark tannin stained water.
The MacFarlane River begins at Rocky Lake and heads southwest reaching Bluff Lake and the unincorporated place of Brinka. It continues southwest to Grindstone Lake, where it takes in the left tributary Boot Creek, then to Basket Lake and the community of Redditt. The river continues southwest to Corn Lake, where it takes in the left tributary Talbot Creek, passes out, takes in the left tributary Whitney Creek and reaches Ena Lake, where it takes in the right tributary Octopus Creek. It continues southwest over a control dam, and reaches its mouth at the Winnipeg River. For almost the entire course, the river is paralleled by the Canadian National Railway transcontinental main line,[1]