| Conventional Long Name: | Prince-Bishopric of Regensburg |
| Common Name: | Regensburg, Bishopric |
| Era: | Middle Ages |
| Status: | Prince-Bishopric |
| Empire: | Holy Roman Empire |
| Government Type: | Elective principality |
| Year Start: | 13th century |
| Year End: | 1803 |
| Event Pre: | Founded by St Boniface |
| Date Pre: | 739 |
| Event Start: | Gained Reichsfreiheit |
| Event1: | Regensburg Reichsfrei as Imperial City |
| Date Event1: | 1245 |
| Event2: | City annexed to Bavaria |
| Date Event2: | 1486–1496 |
| Event3: | City adopted Reformation |
| Date Event3: | 1542 |
| Event4: | City made permanent seat of Reichstag |
| Date Event4: | 1663–1806 |
| Event End: | Mediatised to new Archbishopric¹ |
| Event Post: | Ceded to Bavaria on Imperial collapse |
| Date Post: | January 6, 1806 |
| P1: | Duchy of Bavaria |
| Flag P1: | Rautenflagge (24 Rauten).svg |
| S1: | Principality of Regensburg |
| Flag S1: | Flag of the Principality of Regensburg.svg |
| Capital: | Regensburg Cathedral |
| Footnotes: | 1: The Bishopric, the Imperial City and all three Imperial Abbeys were mediatised simultaneously. |
The Prince-Bishopric of Regensburg (German: Fürstbistum Regensburg; Hochstift Regensburg) was a small ecclesiastical principality of the Holy Roman Empire located near the Free Imperial City of Regensburg in Bavaria. It was elevated to the Archbishopric of Regensburg in 1803 after the dissolution of the Archbishopric of Mainz. The Prince-Bishopric of Regensburg must not be confused with the Roman Catholic Diocese of Regensburg, which was considerably larger.
The diocese was founded in 739 by Saint Boniface;[1] it was originally subordinate to the archbishop of Salzburg. In the 13th century, the bishop of Regensburg became a prince of the Holy Roman Empire with a seat and vote at the Imperial Diet. As an enclave of the Duchy of Bavaria, the prince-bishopric was not able to expand territorially and remained one of the smallest of the Empire.
In the course of the German mediatization of 1803, the prince-bishopric was united with the Free Imperial city of Regensburg and other territories to form the Principality of Regensburg. Karl Theodor Anton Maria von Dalberg was the first prince-archbishop. In 1810, the pincipality became part of the Kingdom of Bavaria, although it retained archiepiscopal status. This followed the fall of the Holy Roman Empire in 1806 during the War of the Third Coalition.
The Bavarian Concordat of 1817 following Dalberg's death downgraded the Archdiocese of Regensburg into a suffragan diocese subordinate to the archbishop of Munich and Freising.
See main article: Bishop of Regensburg.