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

The Rivière du Cinq flows in the administrative region of Chaudière-Appalaches, in Quebec, in Canada, in the MRC of: The main neighboring watersheds of the Five River are: The Rivière du Cinq has its source at Lac du Cinq (length: 430 metres (1,410 ft); altitude: 601 metres (1,972 ft)) which straddles the municipalities of Saint-Pierre-de-Broughton and Saint-Pierre-de-Broughton.

From its source, the Rivière du Cinq flows over 23.1 kilometres (14.4 mi) divided into the following segments: The Rivière du Cinq flows on the west bank of the Bras Saint-Victor in the municipality of Saint-Victor.

The confluence of the Rivière du Cinq is located 0.9 kilometres (0.56 mi) upstream from the confluence of the Prévost-Gilbert River, at 1.5 kilometres (0.93 mi) north-west of center of the village of Saint-Victor and 1.1 kilometres (0.68 mi) north of route 108.

The toponym Rivière du Cinq was made official on June 12, 1970, at the Commission de toponymie du Québec.