| De Lesseps River | |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the De Lesseps 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: | 50.5678°N -90.8397°W |
| Source1 Elevation: | 435m (1,427feet) |
| Mouth: | Miniss River |
| Mouth Coordinates: | 50.8242°N -90.6911°W |
| Mouth Elevation: | 379m (1,243feet) |
| River System: | James Bay drainage basin |
The De Lesseps 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 right tributary of the Miniss River.
The river begins at an unnamed lake and heads east then northeast to De Lesseps Lake, where De Lesseps Lake Airport is located on the eastern shore. It leaves the lake north, and reaches its mouth at Miniss Lake on the Miniss River. The Miniss River flows to Lake St. Joseph, then via the Albany River to James Bay.