Les Collines-de-l'Outaouais (French pronunciation: [le kɔlin də lutawɛ], "The hills of the Outaouais") is a regional county municipality in the Outaouais region of western Quebec, Canada.

The region nearly encircles the City of Gatineau, which is to the south.

It was created in January 1991 when the Communauté régionale de l'Outaouais (Outaouais Regional Community) was split into Les Collines-de-l'Outaouais RCM and the Communauté urbaine de l'Outaouais (Outaouais Urban Community, now City of Gatineau).

It is bisected by the Gatineau River which flows from north to south.

There are six subdivisions within the RCM:[2] Source: 2021 Census [3] Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[7]