Schlossbrauerei Au-Hallertau is a historic brewery located in Au in der Hallertau, Bavaria, Germany. Situated within a historic castle and at the heart of one of the world's most renowned hop-growing regions, the Hallertau, the brewery has been crafting traditional Bavarian beers for over 400 years. This deep-rooted heritage places it among the oldest and most storied brewing establishments in Germany, with a long-standing commitment to the Bavarian Purity Law (Reinheitsgebot). The brewery's portfolio reflects a strong connection to its Bavarian roots, with a focus on traditional lager styles and regional specialities. Among its beers, the Auer Kellerbier — a Kellerbier/Zwickelbier — stands out as a well-regarded unfiltered lager brewed in the naturally hop-rich Hallertau style. The brewery also produces a Castle Rye IPA and a range of other styles, demonstrating a willingness to explore beyond purely classic Bavarian traditions. Schlossbrauerei Au-Hallertau is additionally known for contract brewing, including producing Singha lager under licence for Singha Corporation Co., Ltd. The brewery has earned international recognition, including a Silver medal at the 2021 Melbourne Royal Awards for its Auer Dunkles. Its location in a historic castle and its deep ties to the Hallertau hop-growing region make it a compelling destination for beer enthusiasts visiting Bavaria.