St. Peter's Abbey, Saskatchewan, Benedictine abbey in Muenster, Saskatchewan, Canada

St. Peter's Abbey is a Benedictine monastery on rural grounds in Saskatchewan featuring a cathedral, monastic buildings, and maintained agricultural areas. The compound includes multiple structures that support the daily life and work of the resident community.

St. Peter's Abbey began in 1903, when seven Benedictine monks arrived from Saint John's Abbey in Collegeville, Minnesota, under Abbot Peter Engel, to serve the more than 700 German-speaking Catholic homesteads in the area. It became an independent abbey in 1911 with Bruno Doerfler as first abbot, and from 1921 to 1998 it was the Territorial Abbey of Saint Peter-Muenster, a jurisdiction of 4,662 square kilometres.

The 1909–1910 St. Peter's Cathedral, about a kilometre from Muenster village, was decorated in 1919 by the artist Berthold Imhoff and served as the cathedral of the Territorial Abbey. It was listed on the Canadian Register of Historic Places in 2008. A new church adjoining the abbey and St. Peter's College was consecrated in 1989.

St. Peter's Abbey stands about one kilometre from the village of Muenster, with St. Peter's Cathedral, built 1909–1910, on that outlying site and a newer church of 1989 adjoining the abbey and St. Peter's College. The community follows the Rule of St. Benedict, balancing prayer, work and study, so visitors should expect a working monastery rather than a museum.

St. Peter's Abbey was the centre of St. Peter's Colony, a settlement that drew 8,000 settlers by 1910 and counted 18,000 Roman Catholics by 1930, most of them German. The monks served the colony's parishes in German, beginning with St. Boniface at Leofeld on 17 May 1903. The territorial abbey, 4,662 square kilometres carved from the Diocese of Prince Albert in 1921, was suppressed in 1998 and folded into the Diocese of Saskatoon.