| Native Name: | Reichskloster St Peter auf dem Schwarzwald |
| Conventional Long Name: | Imperial Abbey of St Peter in the Black Forest |
| Common Name: | Saint Peter's Abbey, Black Forest |
| Era: | Middle Ages |
| Status: | Imperial Abbey |
| Empire: | Holy Roman Empire |
| Government Type: | Theocracy |
| Year Start: | 11th century |
| Year End: | 1806 |
| Event Pre: | Abbey founded |
| Date Pre: | 1073 or before |
| Event Start: | Imperial immediacy |
| Event1: | Vögterei passed from Zähringen to Urach |
| Date Event1: | late 13th century |
| Event2: | Vögterei passed from Urach to Habsburgs |
| Date Event2: | 1526 |
| Event End: | Secularised to Baden |
| P1: | Duchy of Swabia |
| S1: | Grand Duchy of Baden |
| Capital: | St Peter im Schwarzwald |
St Peter's Abbey in the Black Forest or St. Peter's Abbey, Schwarzwald (German: Kloster St. Peter auf dem Schwarzwald) is a former Benedictine monastery in the village of St. Peter im Schwarzwald, in the district of Breisgau-Hochschwarzwald, Baden-Württemberg, Germany.
The monastic community of St. Peter's was the house monastery and burial place of the Zähringen family. It was founded in Weilheim, in or before 1073, but was forced by hostile military action during the Investiture Controversy to move to Hirsau. Duke Berthold II of Zähringen (1078–1111) re-founded it as a family monastery, but decided in about 1090 to move it to the site which is now St. Peter im Schwarzwald.
Here it soon developed as a reformed Benedictine monastery directly answerable to the papacy, as witness for example the privilege of Pope Urban II of 10 March 1095. The Vögte (lords protectors) were initially the Zähringen family but, in the late 13th century, they were succeeded by the Counts of Urach, against whom the monks were eventually obliged to seek the protection of Emperor Charles IV. In 1526 the office passed to the Habsburgs. In the 1520s its prior Michael Sattler became a leader of the Anabaptists.[1]
By the gift of the Zähringen family and their ministeriales the abbey acquired substantial property, particularly in the 11th and 12th centuries, located in the immediate area, in the Breisgau and in the Baar region, near Weilheim. The abbey, like most other landowners of the time, suffered significant loss of income and tenants after the middle of the 14th century.
The abbey suffered disastrous fires in 1238 and again in 1437. It lost importance in the later mediaeval period, and the monastic reforms of the 15th century had little effect here. Nevertheless, it managed to keep its property intact, even through the troubles of the Reformation. The premises were re-built in Baroque style in the 17th and 18th centuries; the present church with the two onion towers ("Zwiebeltürme") was built in the 1720s. The architect was Peter Thumb, and the opulent Baroque decoration was by Franz Joseph Spiegler (55 frescoes, 1727) and Joseph Anton Feuchtmayer (sculptures), among other artists and craftsmen. Peter Thumb also constructed the library. The abbey was dissolved in the secularisation of 1806.
Abbots of the Early Modern period include: