| Miniss River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Miniss 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: | Thunder Bay |
| Source1: | Unnamed lake |
| Source1 Coordinates: | 50.5°N -90.6858°W |
| Source1 Elevation: | 493m (1,617feet) |
| Mouth: | Lake St. Joseph |
| Mouth Coordinates: | 50.9158°N -90.9392°W |
| Mouth Elevation: | 374m (1,227feet) |
| River System: | James Bay drainage basin |
| Tributaries Left: | St. Raphael River |
| Tributaries Right: | De Lesseps River |
The Miniss River is a river in the Unorganized Part of Thunder Bay District in Northwestern Ontario, Canada.[1] The river is part of the James Bay drainage basin and is a tributary of Lake St. Joseph.
The river begins at an unnamed lake and flows north to Hill Lake. It turns southwest to Yam Lake, then flows northeast through Hooker Lake and Arc Lake to Miniss Lake, where it takes in the right tributary De Lesseps River. The river heads north, takes in the left tributary St. Raphael River, and reaches its mouth at Miniss Bay on Lake St. Joseph, the source of the Albany River, which flows to James Bay.