| Saganash River | |
| Name Other: | French: Rivière Saganash |
| Pushpin Map: | Canada Ontario |
| Pushpin Map Caption: | Location of the mouth of the Saganash River in Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northeastern Ontario |
| Subdivision Type4: | District |
| Subdivision Name4: | Cochrane |
| Source1: | Saganash Lake |
| Source1 Location: | Staples Township |
| Source1 Coordinates: | 49.0931°N -82.5775°W |
| Source1 Elevation: | 251m (823feet) |
| Mouth: | Kapuskasing River |
| Mouth Location: | O'Brien Township / Kapuskasing |
| Mouth Coordinates: | 49.3639°N -82.4692°W |
| Mouth Elevation: | 212m (696feet) |
| River System: | James Bay drainage basin |
| Tributaries Right: | Little Saganash River |
The Saganash River (Official name in fr|'''Rivière Saganash''') is a river in Cochrane District in northeastern Ontario, Canada.[1] It is in the James Bay drainage basin, and is a right tributary of the Kapuskasing River.
The river begins at the north end of Saganash Lake in geographic Staples Township,[2] and flows north, takes in the right tributary Staples Creek, and enters geographic Sulman Township.[3] It turns northeast, takes in the right tributary Little Saganash River, and passes through the northwest corner of geographic Swanson Township[4] into geographic O'Brien Township.[5] The final 1350m (4,430feet) middle of the river forms the border between O'Brien Township and the Town of Kapuskasing, after which the river reaches its mouth at the Kapuskasing River. The Kapuskasing River flows via the Mattagami River and the Moose River to James Bay.