| Rivière du Rat Musqué | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Chaudière-Appalaches |
| Subdivision Type4: | MRC |
| Subdivision Name4: | L'Islet Regional County Municipality |
| Source1: | Lac du Rat Musqué |
| Source1 Location: | Sainte-Perpétue |
| Mouth: | Grande Rivière |
| Mouth Location: | Tourville |
| Basin Size: | NaNkm (-2,147,483,648miles) |
| Tributaries Left: | (upstream) |
| Tributaries Right: | (upstream) |
The rivière du Rat Musqué (in English: Muskrat River) flows successively in the municipality of Sainte-Perpétue and in the municipalities of Tourville, in the L'Islet Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Québec, in Canada.
The Musk Rat River is a tributary of the east bank of Grande Rivière, which flows onto the east bank of the Ouelle River which in turn flows into the south shore of the St. Lawrence River at Rivière-Ouelle.
The Rivière du Rat Musqué takes its source at Lac du Rat Musqué (length: ; altitude:) which is bypassed on the south side by the Canadian National. This source is located in the heart of Notre Dame Mountains at:
From Lac du Rat Musqué, the Rat Musqué river flows entirely through a forest environment over, divided into the following segments:
The Rat Musqué river meets on the east bank of Grande Rivière. This confluence is located very close to the southeastern limit of the municipality of Saint-Damase-de-L'Islet and at to the southeast of the southern coast of St. Lawrence River.[1]
The toponym Rivière du Rat Musqué was formalized on December 5, 1968, by the Commission de toponymie du Québec.[2]