The Diocese of Mackenzie–Fort Smith (Latin: Dioecesis Mackenziensis–Arcis Smith) is a Latin Church ecclesiastical territory or diocese of the Catholic Church that includes the Northwest Territories, the northern extremity of Saskatchewan and the extreme west of the Territory of Nunavut in Canada. Bishop Jon Hansen,C.Ss.R. currently serves as Bishop of Mackenzie – Fort Smith, Canada.

Originally created in 1901 as the Vicariate Apostolic of Mackenzie, it was elevated to a full episcopal see in 1967.

As of 2004, the diocese contained 46 parishes and missions, 4 active diocesan priests, 7 religious priests, and 28,540 Catholics. At the time, it also had 16 women religious, 8 religious brothers, and 3 permanent deacons. One famous parish is Our Lady Of Victory Church in Inuvik.

• Gabriel-Joseph-Elie Breynat, O.M.I. (1901–1943), "The Bishop of the Winds", Titular Bishop of Adramyttium (1901) and Titular Archbishop of Garella (1939)
• Joseph-Maria Trocellier, O.M.I. (1943–1958)
• Paul Piché, O.M.I. (1959–1967)

The following is a list of the bishops of Mackenzie-Fort Smith and their terms of service:

• Paul Piché (1967–1986)
• Denis Croteau (1986–2008)
• Murray Chatlain (2008–2012), appointed Archbishop of Keewatin-Le Pas, Manitoba
• Mark Hagemoen (2013–2017), appointed Bishop of Saskatoon, Saskatchewan
• Jon Hansen, C.Ss.R (December 15, 2017)

• Pierre-Armand-Albert-Lucien Fallaize, O.M.I. (1931-1939), as Coadjutor Vicar Apostolic; did not succeed to see
• Joseph-Marie Trocellier, O.M.I. (1941-1943), as Coadjutor Vicar Apostolic
• Murray Chatlain (2007-2008)

• Diocese of Mackenzie-Fort Smith page at catholichierarchy.org retrieved July 14, 2006
• Press release from the Canadian Conference of Catholic Bishops at cccb.ca Archived May 13, 2008, at the Wayback Machine retrieved May 19, 2008

62°27′00″N 114°24′00″W / 62.4500°N 114.4000°W / 62.4500; -114.4000