St. Peter's Abbey is in Muenster, Saskatchewan, Canada. It is the oldest Benedictine monastery in Canada. It was founded in 1903.
St. Peter's Abbey began in 1903 with the arrival of seven Benedictine monks under the obedience of Peter Engel O.S.B. the abbot of Saint John's Abbey in Collegeville, Minnesota. Many German speaking Roman Catholic immigrants had settled in the area and by 1903 they had over 700 homesteads. The monks established parishes and were able to serve their congregations in the German language.
St. Peter Abbey became independent in 1911 and Bruno Doerfler became its first abbot.
In 1921 St. Peter's Abbey became the Territorial Abbey of Saint Peter-Muenster. It was formed from a piece of the Diocese of Prince Albert 4,662 square kilometers (1,800 square miles) in size. It included 50 townships; townships 35 to 40, ranges 18 to 22, and townships 37 to 41, ranges 23 to 26 of the Dominion Land Survey west of the 2nd Meridian. The abbot's duties were similar to those of a bishop of a diocese. The Territorial Abbey was suppressed in 1998 to become part of the Roman Catholic Diocese of Saskatoon.
Today it remains an abbey, but is no longer a separate jurisdiction.
St. Peter's Cathedral was built between 1909 and 1910 and decorated by artist Berthold Imhoff in 1919. The church served as the cathedral of the territorial abbey. Located about one kilometre from the village of Muenster it was listed on the Canadian Register of Historic Places in 2008.