The rivière aux Cailloux (English: Pebble River) is a tributary of the Gulf of St. Lawrence, flowing in the municipality of L'Île-d'Anticosti, in the Minganie Regional County Municipality, in the administrative region of North Shore, in province of Quebec, in Canada.

The course of the intermediate part (from Lac aux Cailloux, going south) of this watercourse delimits the western zone of SÉPAQ Anticosti.

[1] The main forest road (east-west) of Anticosti Island serves the upper part of this valley.

[2] The Rivière aux Cailloux draws its source from Lac Noël (length: 0.8 km (0.50 mi); altitude: 111 m (364 ft)) located in the center-west of Anticosti Island.

[2] This toponymic designation appears in the 1904 book, entitled "Monographie de l'Île Anticosti".