The König Ludwig GmbH & Co. KG Schlossbrauerei Kaltenberg is a brewery in Fürstenfeldbruck, Upper Bavaria, Germany.

The current proprietor, Prince Luitpold of the House of Wittelsbach, is the great-grandson of the last King of Bavaria, Ludwig III, and by extent a descendant of the original signatories of the 1516 Bavarian Purity Law, and Ludwig I, whose wedding celebration marked the first Oktoberfest.

[1] 32 years later, Rudolf I, Duke of Bavaria built Schloss Kaltenberg, which houses part of the brewery's facilities today.

In 1980, Marthabräu brewery in Fürstenfeldbruck was purchased, where the company administration is now located and where a large part of its production takes place.

Much of the international production takes place under licence in the United Kingdom, Sweden, India, Indonesia and Croatia under the Kaltenberg brand.