The Ducal Bavarian Brewery of Tegernsee is a brewery in Tegernsee, Bavaria, Germany, located inside the north wing of former Tegernsee Abbey and owned by Maria Anna, Duchess in Bavaria, youngest daughter of Max, Duke in Bavaria.

The business traces its roots back to a brewery that was allegedly founded in the year 1050 at lake Tegernsee, where in 746 the Benedictine Tegernsee Abbey had been established.

Since then, the brewery has operated under a number of different names, including Tegernseer Klosterbrauerei ("Tegernsee Monastic Brewery"). After the secularization in the beginning of the 19th century, it was purchased in 1817 by Maximilian I Joseph of Bavaria from Karl Joseph von Drechsel and incorporated under the name Königlich braunes Brauhaus Tegernsee ("Royal Brown Brewhouse of Tegernsee"). Since then, it has been in the ownership of the House of Wittelsbach. The current owner, Duke Max Emanuel in Bayern, ensured a significant expansion of business in the last quarter of the 20th century.