| Mazarin | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Saguenay-Lac-Saint-Jean |
| Length: | 15.1km (09.4miles)[1] |
| Source1: | Mazarin Lake |
| Source1 Location: | Lac-Ashuapmushuan, Quebec (unorganized territory), RCM Le Domaine-du-Roy, Saguenay-Lac-Saint-Jean, Quebec |
| Source1 Coordinates: | 49.4747°N -73.4739°W |
| Source1 Elevation: | 327m (1,073feet) |
| Mouth: | Ashuapmushuan River |
| Mouth Location: | Lac-Ashuapmushuan, Quebec (unorganized territory), RCM Le Domaine-du-Roy, Saguenay-Lac-Saint-Jean, Quebec |
| Mouth Coordinates: | 49.3881°N -73.47°W |
| Mouth Elevation: | 318m (1,043feet) |
The Mazarin River is a tributary of the Ashuapmushuan River, flowing into the unorganized territory of Lac-Ashuapmushuan, Quebec, into the Regional County Municipality (MRC) of Le Domaine-du-Roy, in the administrative region of Saguenay-Lac-Saint-Jean, in Quebec, in Canada.
The Mazarin river flows entirely in the canton of Théberge. Forestry is the main economic activity of this valley; recreational tourism activities, second.
The Forest Road R0203 (North-South direction) serves the valley of the Mazarin River, the Hilarion River, the Du Chef River and the Nestaocano River; this road starting south at the junction of route 167 which links Chibougamau to Saint-Félicien, Quebec.
The surface of the Mazarin River is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.
The toponym "Rivière Mazarin" was officialized on December 5, 1968, at the Commission de toponymie du Québec, when it was created.[2]