The eastern cougar or eastern puma is a subspecies designation proposed in 1946 for cougar populations in eastern North America. The subspecies as described in 1946 was declared extinct by the U.S. Fish and Wildlife Service in 2011. However, the 1946 taxonomy is now in question. The Canadian Wildlife Service has taken no position on the taxonomy. Cougars are currently common in western North America and may be expanding their range. Individuals are occasionally seen as vagrants in eastern North America.

The cougar, also known as the panther, mountain lion, catamount and puma, is a large cat native to the Americas. It inhabits North, Central and South America, making it the most widely distributed wild, terrestrial mammal in the Western Hemisphere, and one of the most widespread in the world. Its range spans the Canadian Territory of Yukon, British Columbia and Alberta provinces, the Rocky Mountains and areas in the Western United States. Further south, its range extends through Mexico to the Amazon Rainforest and the southern Andes Mountains in Patagonia. It is an adaptable, generalist species, occurring in most American habitat types. It prefers habitats with dense underbrush and rocky areas for stalking but also lives in open areas.