Fort St. John is a city located in northeastern British Columbia, Canada. The most populous municipality in the Peace River Regional District, the city encompasses a total area of about 22 km2 (8.5 sq mi) with 21,465 residents recorded in the 2021 Census. Located at Mile 47 of the Alaska Highway, it is one of the largest cities between Dawson Creek, British Columbia and Delta Junction, Alaska. Established in 1794 as a trading post, Fort St. John is the oldest European-established settlement in present-day British Columbia. The city is served by the Fort St. John Airport. The municipal slogan is Fort St. John: The Energetic City.

The Peace River Regional District is a regional district in northeastern British Columbia, Canada. The regional district comprises seven municipalities and four electoral areas. Its member municipalities are the cities of Fort St. John and Dawson Creek, the district municipalities of Tumbler Ridge, Chetwynd, Taylor, and Hudson's Hope, and the village of Pouce Coupe. The district's administrative offices are in Dawson Creek.