The Diocese of Calgary () is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Alberta, Canada. The Diocese of Calgary is a suffragan diocese of the metropolitan Archdiocese of Edmonton.

Its cathedral episcopal see is St. Mary’s Cathedral, Calgary, Alberta. It is currently led by Bishop William McGrattan.

History The diocese was established on 30 Nov. 1912 as Diocese of Calgary, Latin adjective , on territory split off from the Diocese of Saint Albert.

Bishops Diocesan ordinaries (all Roman Rite) Suffragan Bishops of Calgary John Thomas McNally (1913.04.04 – 1924.08.12); later Bishop of Hamilton (Ontario, Canada) (1924.08.12 – 1937.02.17), Metropolitan Archbishop of Halifax (Canada) (1937.02.17 – death 1952.11.18) John Thomas Kidd (1925.02.06 – 1931.07.03), next Bishop of London (Ontario, Canada) (1931.07.03 – death 1950.06.02) Peter Joseph Monahan (1932.06.10 – 1935.06.26), next Metropolitan Archbishop of Regina (Canada) (1935.06.26 – death 1947.05.06) Francis Patrick Carroll (1935.12.19 – retired 1966.12.28), emeritate as Titular Bishop of Horrea (1966.12.28 – death 1967.02.25) Auxiliary bishop Joseph Lawrence Wilhelm (1963.06.25 – 1966.12.14), Titular Bishop of Saccæa (1963.06.25 – 1966.12.14); later Metropolitan Archbishop of Kingston (Canada) (1966.12.14 – retired 1982.03.12); died 1995 Francis Joseph Klein (1967.02.25 – death 1968.02.03); previously Bishop of Saskatoon (Canada) (1952.02.28 – 1967.02.25) (1968.06.20 – retired 1998.01.19), died 2004 Frederick Henry (1998.01.19 – retired 2017.01.04), previously Titular Bishop of Carinola (1986.04.18 – 1995.03.24) as Auxiliary Bishop of London (Canada) (1986.04.18 – 1995.03.24), Bishop of Thunder Bay (Canada) (1995.03.24 – 1998.01.19), died 2024 William McGrattan (4 January 2017 – ...); previously Titular Bishop of Furnos minor (2009.11.06 – 2014.04.08) as Auxiliary Bishop of Toronto (Canada) (2009.11.06 – 2014.04.08), Bishop of Peterborough (Canada) (2014.04.08 – 2017.01.04).

Auxiliary bishop Joseph Lawrence Wilhelm (1963-1966), appointed Archbishop of Kingston

Statistics and extent It includes the Calgary Region, all of southern Alberta and the extreme lower half of the Alberta's Rockies region.

As per 2014 it pastorally served 538,000 Catholics (45.5% of 1,183,000 total) on 110,500 km² in 69 parishes with 158 priests (123 diocesan, 35 religious), 50 deacons, 166 lay religious (46 brothers, 120 sisters) and 10 seminarians.

The diocese contains 82+ parishes and missions specifically: 37 parishes in Calgary alone; of which, 10 are ethnic parishes, an additional university parish to serve the University of Calgary and 45+ parishes and missions designated for southern Alberta and the Rockies lower region. On December 3, 2017 Bishop McGrattan announced his intention to make Our Lady of the Rockies Parish in Canmore into a Diocesan Marian Shrine in the spring of 2019.

In 2006: 87 diocesan priests, 38 religious priests 427,200 Catholics. 110 women religious, 48 religious brothers and 30 permanent deacons make up the spiritual work force in Calgary not including the other regions.

In 2026, the diocese reported a 50% increase in the number of people wanting to join the church since the COVID-19 pandemic, with Church’s Rite of Christian Initiation of Adults instructor Brian Trafford saying that the diocese saw a record number of converts in both 2025 and 2026.

Calgary city Parishes

Downtown: St. Mary's Cathedral Sacred Heart St. Francis of Assisi Northwest: Ascension Canadian Martyrs Corpus Christi Our Lady Queen of Peace (Polish) Our Lady of the Assumption St. Bernard St. Boniface (German) St. Joseph St. Luke St. Peter's St. Pius X University of Calgary Catholic Community Northeast Our Lady of Grace (Italian & English) Our Lady of Guadalupe (Spanish & English) Our Lady of Perpetual Help (Chinese & English) St. Mark St. Thomas More Southwest Holy Name Holy Spirit (Spanish & English) St. Anthony St. Elizabeth of Hungary (Magyar-Hungarian) Sainte-Famille (French) St. Gerard St. James St. Michael the Archangel St. Mother Teresa Syro Malabar Southeast Holy Trinity Our Lady of Fatima (Portuguese & English) Our Lady of Mt. Bistrica (Croatian & English) St. Albert the Great St. Anne (Korean) St. Bernadette St. Bonaventure St. Cecilia's St. John the Evangelist St. Patrick's St. Vincent Liem (Vietnamese)

Rural Parishes and Missions

Airdrie St. Paul Banff St. Mary's Beiseker St. Mary's Blairmore (Crowsnest Pass) Holy Trinity Bow Island St. Michael's Mission: Our Lady of Perpetual Help, Foremost Brocket St. Paul's Brooks St. Mary's Canmore Our Lady of the Rockies Carstairs St. Agnes Catholic Parish Chestermere St. Gabriel the Archangel Claresholm Christ the King Mission: St. Cecilia, Nanton Mission: St. Mary's, Champion

Cluny St. Mary's Coaldale St. Ambrose Cochrane St. Mary's Drumheller St. Anthony Fort Macleod Holy Cross Mission: St. Theresa, Cardston Hanna St. George's High River St. Francis de Sales Mission: St. Andrew's, Vulcan Lethbridge Our Lady of the Assumption St. Basil's St. Patrick's St. Martha Medicine Hat Holy Family St. Patrick

Milk River St. Peter Mission: St. Isidore's, Allerston Okotoks St. James Mission: St. Michael's, Black Diamond Oyen Sacred Heart Picture Butte St. Catherine's Pincher Creek St. Michael Mission: Our Lady of Mt. Carmel, Waterton Rockyford St. Rita Siksika Nation Holy Trinity Standoff Immaculate Conception Mission: four churches on the Blood Reserve Strathmore Sacred Heart Taber St. Augustine Vauxhall St. Joseph

See also

List of Catholic dioceses in Canada

References

Sources and external links

GCatholic with Google map and - satellite photo Diocese of Calgary page at catholichierarchy.org retrieved July 14, 2006 Roman Catholic Archdiocese of Edmonton