The Cariboo Plateau is a volcanic plateau in south-central British Columbia, Canada. It is part of the Fraser Plateau that itself is a northward extension of the North American Plateau. The southern limit of the plateau is the Bonaparte River although some definitions include the Bonaparte Plateau between that river and the Thompson, but it properly is a subdivision of the Thompson Plateau. The portion of the Fraser Plateau west of the Fraser River is properly known as the Chilcotin Plateau but is often mistakenly considered to be part of the Cariboo Plateau, which is east of the Fraser.
As a region and historical identity, the Cariboo is sometimes considered to extend to the Thompson River to the south of that, and to border on the city of Kamloops at its southeastern corner and even as far as Lytton, at the confluence of the Fraser and Thompson Rivers. The town of Lillooet is generally considered to be in the Cariboo, while the Bridge River Country to its west was sometimes referred to as the West Cariboo, as were also the ranches along the west side of the Fraser northwards towards the Gang Ranch. Broader meanings of "the Cariboo" sometimes include the Chilcotin, west of the Fraser. The geographic region known as the Quesnel Highland, which forms a mountainous series of foothills between the plateau proper and the Cariboo Mountains, is likewise considered to be part of the Cariboo in a cultural-historical sense – not the least because it is the location of the famous Cariboo goldfields and the one-time economic capital of the Interior of British Columbia, Barkerville.