Diocese of Mackenzie–Fort Smith

Diocese of Mackenzie–Fort Smith; Dioecesis Mackenziensis–Arcis Smith
	St. Joseph's Cathedral, Fort Smith
Location
Country	Canada
Ecclesiastical province	Grouard-McLennan
Headquarters	Yellowknife
Statistics
Area	1,303,400 km2 (503,200 sq mi)
Population	16,500 (32%)
Information
Denomination	Catholic
Sui iuris church	Latin Church
Rite	Roman Rite
Cathedral	St. Joseph Cathedral
Current leadership
Pope	Leo XIV
Bishop	Jon Hansen, C,Ss.R.
Metropolitan Archbishop	Charles Duval, C.Ss.R.
Bishops emeritus	Denis Croteau
Map
Website
	mfsdiocese.ca

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 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.

In 2021 the border of the diocese changed, losing the Athabasca region in northern Saskatchewan. After that the number of parishes and missions is up to 26. In 2025 the number of incardinated priests was 2 (1 retired outside the diocese) and 2 permanent deacons both outside the diocese.

Bishops

Diocesan bishops

Vicariate Apostolic of Mackenzie

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)

Coadjutor bishops

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)