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The Archbishopric — or Principality — of Regensburg was a short-lived ecclesiastical principality within the Holy Roman Empire which existed between 1803 and 1806.
The principality was created in Regensburg for Karl Theodor von Dalberg, the Prince-Primate of the Empire and the former Archbishop of Mainz, due to the annexation of Mainz itself by the French under the Treaty of Lunéville. The new archbishopric consisted of the territory of the old Bishopric of Regensburg that had been founded in 739 by St Boniface, along with the Aschaffenburg area along the Main which had been part of the old Archbishopric of Mainz. The Archbishopric ceased to exist along with the Holy Roman Empire in 1806. Regensburg itself was annexed by Bavaria — ratified by the Treaty of Paris in 1810 — while the Aschaffenburg region became the nucleus of the new Grand Duchy of Frankfurt, whose first ruler was the former Prince-Primate.
Today, the area belongs to the Archdiocese of Munich and the German Land of Bavaria.