La Vallée-de-la-Gatineau est une municipalité régionale de comté de la province de Québec (Canada) dans la région administrative de l'Outaouais. Son chef-lieu est Gracefield. Elle a été constituée le .
La Vallée-de-la-Gatineau (The Valley of the Gatineau) is a regional county municipality in the Outaouais region of western Quebec, Canada. The seat is in Gracefield. It was incorporated on January 1, 1983, and was named for its location straddling the Gatineau River north of Low.
It consists of two cities, fifteen municipalities, and five unorganized territories. The area also has two Algonquin communities, Rapid Lake in the heart of the La Vérendrye Wildlife Reserve and Kitigan Zibi.
The territory of the Gatineau Valley is bordered by other Outaouais RCMs: to the east by the Antoine-Labelle Regional County Municipality, to the southeast by Papineau RCM, to the south by the Les Collines-de-l'Outaouais RCM and to the west by the Pontiac Regional County Municipality. To the north is La Vallée-de-l'Or Regional County Municipality in the Abitibi-Témiscamingue region. Numerous lakes abound in the area, including everything from the small Lac des Pins to 31 Mile Lake.
The administrative centre for La Vallée-de-la-Gatineau is north of Kitigan Zibi in Maniwaki, previously the county seat of historic Gatineau County.