Western Canada is the smallest geographical area of all those outlined, but also hosts the largest diversity of big game species. This area includes the portion of the country west from the foothills of the Rocky Mountains to the Pacific coast, the western portion of Alberta and all of the province of British Columbia.

These two areas have the largest number of big game species anywhere in the country, with BC boasting the greatest number of species. Grizzly bear and elk roam throughout the Rocky Mountain areas as well as several other mountainous regions within the interior of British Columbia. Both provinces also have large populations of mule and white tail deer and black bears. Cougar and bighorn sheep can be found in every region of British Columbia, and Vancouver Island has the largest concentration of these big cats found anywhere in the world. Vancouver Island also has large herds of the once endangered Roosevelt elk, and along with the Pacific Coast area is home to a third deer species, the small black tails.

The prairie regions of northern British Columbia are one of the only places in the world where the North American bison can be hunted, both the wood and prairie variety. The mountains are also home to two species of thinhorn sheep, the Dall and the Stone. Caribou can also be hunted in some parts of British Columbia.

The general rule when considering hunting big game in Canada is that the farther north one goes, the bigger the game gets. Another rule which is certainly evident when diversity is considered is that the further west one goes, the more diverse the number of big game species. The north east corner of British Columbia in particular is home to a huge number of species.