Dolbeau-Mistassini is a town in northern Quebec, Canada, at the confluence of the Mistassibi River, Riviere aux Rats and the Mistassini River, on Lac Saint-Jean. Dolbeau-Mistassini is in the Maria-Chapdelaine Regional County Municipality and is the commercial hub of Lac-St-Jean with big stores and shopping centres.
The city was formed in 1997 through the amalgamation of the cities of Dolbeau and Mistassini. Dolbeau is located on the right (west) bank of the Mistassini River, in the geographic township of Parent (not in the adjacent Dolbeau Township). The town of Mistassini is on the left (east) bank of the Mistassini River at the confluence with the Mistassibi River, directly opposite Dolbeau.