| Saint-Jean River | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Chaudière-Appalaches, Bas-Saint-Laurent |
| Subdivision Type4: | MRC |
| Subdivision Name4: | L'Islet Regional County Municipality, Kamouraska Regional County Municipality |
| Source1: | Lake Litalien |
| Source1 Location: | Sainte-Louise |
| Mouth: | St. Lawrence River |
| Mouth Location: | La Pocatière |
| Basin Size: | NaNkm (-2,147,483,648miles) |
| Tributaries Left: | (upstream) ruisseau des Prairies, décharge du lac de la Traverse |
| Tributaries Right: | (upstream) ruisseau Dionne, ruisseau Guy-Lemieux, cours d'eau Bard-Drapeau, cours d'eau Chrétien, décharge du lac Ti-Pierre, cours d'eau Blanchet |
The Saint-Jean River (in French: rivière Saint-Jean) flows through the municipalities of Sainte-Louise (MRC of L'Islet Regional County Municipality), as well as Saint-Onésime-d'Ixworth and La Pocatière, in the Kamouraska Regional County Municipality, in the administrative region of Bas-Saint-Laurent, in Quebec, in Canada.[1]
The toponym Rivière Saint-Jean was formalized on December 5, 1968, by the Commission de toponymie du Québec.[2]