The Capousacataca River is a tributary of the Mégiscane River, flowing into the north-eastern part of Senneterre in La Vallée-de-l'Or Regional County Municipality (RCM), in the administrative region of Abitibi-Témiscamingue, in Quebec, Canada.

The Capousacataca River runs entirely on forest land north-east of the La Vérendrye Wildlife Reserve and on the west side of Gouin Reservoir.

The surface of the river is usually frozen from the beginning of December to the end of April.

The hydrographic slope of the Capousacataca River is served by the R0808 forest road that goes up this valley (first on the west side, then on the east side) to the south east of Charrette Lake, where the road is oriented towards the North -East.

The toponym "Capousacataca River" was formalized on December 5, 1968, at the Commission de toponymie du Québec.