The Thurn-und-Taxis Post (German: [ˈtuːɐ̯n ʊnt ˈtaksɪs ˈpɔst]) was a private company and the successor to the Imperial Reichspost of the Holy Roman Empire. The Thurn-und-Taxis Post was operated by the Princely House of Thurn and Taxis between 1806 and 1867. The company was headquartered in Regensburg from its creation in 1806 until 1810 when it relocated to Frankfurt am Main where it remained until 1867.
Throughout the course of the 16th century, the Taxis dynasty was entrusted as the imperial courier of the Holy Roman Empire and in the Spanish Netherlands, Spain, and Burgundy. In 1595, Leonhard I von Taxis was the empire's Postmaster General. Beginning in 1615, the office of Postmaster General of the Imperial Reichspost became hereditary under Lamoral I von Taxis. In 1650, the house was permitted with imperial authorization to rename itself from the House of Tassis (Taxis) to the House of Thurn and Taxis (from the French Tour et Taxis). As a result, it was able to maintain the Imperial Reichspost in competition with Europe's post offices.
Due to the 1792–1802 French Revolutionary Wars and the following 1803–15 Napoleonic Wars, the Imperial Reichspost gradually lost more and more postal districts during the tenure of Karl Anselm, 4th Prince of Thurn and Taxis, beginning with the Austrian Netherlands, thus depriving the post of important sources of revenue. Upon the death of Karl Anselm on 13 November 1805, the office of Postmaster General was inherited by his son, Karl Alexander, 5th Prince of Thurn and Taxis.