La Petite Rivière à l'Ours crosses the unorganized territory Les Lacs-du-Témiscamingue, in the Témiscamingue Regional County Municipality, in the administrative region of Abitibi-Témiscamingue, in the province of Quebec, in Canada.

The neighboring watersheds of the Petite rivière à l'Ours are: Lake Junco (length: 0.6 km (0.37 mi); altitude: 375 m (1,230 ft)) constitutes the head of the "little Bear river".

This body of water is located south and west of the Fildegrand River.

The river pours into the bottom of a bay (275 m (902 ft)) on the east bank of the Ottawa River, in Holden Lake, facing Grants Creek (Ontario) and Pichette Bay (Ontario).

The toponym Petite rivière à l'Ours was formalized on 5 December 1968 at the Commission de toponymie du Québec.