Fort St. John is a city in northeastern British Columbia, Canada. It is located near the Alberta border and is part of the Peace River Regional District. As of 2021, the population was 21,034.

Fort St. John was originally established as a trading post in 1794, making it the oldest European-established settlement in present-day British Columbia. The city has a rich history tied to the fur trade, agriculture, and oil and gas industries.

The city acts as a service center for the surrounding industrial and agricultural areas. It provides services such as shopping, education, and healthcare.