The Prévost-Gilbert river (in French: rivière Prévost-Gilbert) is a tributary of the west bank of the Bras Saint-Victor which flows into the Chaudière River; the latter flows northward to empty on the south shore of the St. Lawrence River.

It flows in the administrative region of Chaudière-Appalaches, in Quebec, in Canada, in MRC of: The main neighboring watersheds of the Prévost-Gilbert River are: The Prévost-Gilbert River takes its source at the outlet of a small lake located 1.0 kilometre (0.62 mi) northeast of the village of Pontbriand (town of Thetford Mines, on the southern slope of Montagne du Trois, northwest of the village of Robertsonville and 0.6 kilometres (0.37 mi) northeast of route 269.

[1] From its source, the Prévost-Gilbert River flows over 31 kilometres (19 mi) divided into the following segments: The Prévost-Gilbert River flows onto the west bank of the Bras Saint-Victor in the municipality of Saint-Victor.

The confluence of the Prévost-Gilbert River is located 2.0 kilometres (1.2 mi) west of the center of the village of Saint-Victor and 0.9 kilometres (0.56 mi) north of the route 108.

[1] The toponym Rivière Prévost-Gilbert was formalized on October 6, 1983, at the Commission de toponymie du Québec.