Kootenay National Park is a national park located in southeastern British Columbia, Canada, and is one component of the Canadian Rocky Mountain Parks World Heritage Site. The park consists of 1,406 km² (543 sq mi) of the Canadian Rockies, including parts of the Kootenay and Park mountain ranges, the Kootenay River and the entirety of the Vermilion River. While the Vermillion River is completely contained within the park, the Kootenay River has its headwaters just outside the park boundary, flowing through the park into the Rocky Mountain Trench, eventually joining the Columbia River. It ranges in elevation from 918 m (3,012 ft) at the southwestern park entrance, to 3,424 m (11,234 ft) at Deltaform Mountain. Initially called "Kootenay Dominion Park", the park was created in 1920 as part of an agreement between the province of British Columbia and the Canadian federal government to build a highway in exchange for title to a strip of land, approximately 8 km (5.0 mi) on either side of the 94 km route, the Banff-Windermere Highway, to be used solely for park purposes. While the park is open all year, the major tourist season lasts from June to September. Most campgrounds are open from early May to late September, while limited winter camping is available only at the Dolly Varden campground.

The Kootenay National Park is one of seven contiguous parks that form the Canadian Rocky Mountain Parks World Heritage Site. The Continental Divide is the boundary between the Kootenay and Banff National Park boundary, as well as the BC-Alberta provincial border. To the northwest, the watershed boundary between the Vermillion River and the Kicking Horse River is the park boundary between the Kootenay and Yoho National Park. The Mount Assiniboine Provincial Park also borders the Kootenay National Park. Jasper National Park, Mount Robson Provincial Park and Hamber Provincial Park make up the remainder of the World Heritage Site but do not share a boundary with Kootenay National Park.