| Assinica | |
| Map: | Broadback map.png |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Nord-du-Québec |
| Length: | 59.2km (36.8miles)[1] |
| Source1: | Assinica Lake |
| Source1 Location: | Nord-du-Québec, Eeyou Istchee Baie-James (municipality), Quebec |
| Source1 Coordinates: | 50.5486°N -75.305°W |
| Source1 Elevation: | 359m (1,178feet) |
| Mouth: | Broadback River |
| Mouth Location: | Eeyou Istchee Baie-James (municipality), Nord-du-Québec, Quebec |
| Mouth Coordinates: | 50.71°N -75.5567°W |
| Mouth Elevation: | 291m (955feet) |
The Assinica River is a tributary of the Broadback River flowing west to Rupert Bay south of James Bay. The Assinica River flows into the municipality of Eeyou Istchee Baie-James (municipality) in the Nord-du-Québec administrative region, in Quebec, in Canada.
The group of head lakes of the Assinica River is composed of lakes: Assinica, Comencho, Waposite, Cachisca and Opataca. Forestry is the main economic activity of the sector. Recreational tourism activities come second.
The nearest forest road is located south-east of the lake, the road skirting the northern side of Mount Opemisca; this road joins towards the south the route 113 (connecting Lebel-sur-Quévillon and Chibougamau) and the Canadian National Railway.
The surface of the Assinica River is usually frozen from early November to mid-May, however, safe ice movement is generally from mid-November to mid-April.
Of Cree origin, this hydronym means "river filled with stones".
The toponym 'rivière Assinica' was formalized on December 5, 1968, at the Commission de toponymie du Québec.[2]