Fort Severn First Nation is a Western Swampy Cree First Nation band government located on Hudson Bay and is the most northern community in Ontario, Canada. In 2001, the population was 401, consisting of 90 families in an area of 40 square kilometres. The legal name of the reserve is Fort Severn 89, with the main settlement of Fort Severn.

There is no hospital in Fort Severn, with medical needs provided either at the local nursing station or via Keewaytinook Okimakanak Telemedicine (KOTM) link. The Community Doctor (Christopher Arthur Giles) travels in every month to do check-ups, follow-ups, and conduct scheduled appointments/surgeries. Specialists such as Chiropractors, Optometrists, Dentists, and Hygienists travel in every two-three months.

There are only local roads in town and residents travel by car, snowmobile, four wheelers or walking.

The Fort Severn Airport is located a short distance from the settlement and is accessible by an access road.