Arsenal am Pfaffenteich, Military architecture monument near Pfaffenteich lake, Schwerin, Germany.

The Arsenal at Pfaffenteich is a military building that stretches along the lake's southwest bank. Two connected towers with crenellated crowns sit at each end, and the entire structure was built almost entirely from locally sourced bricks.

The grand-ducal arsenal was built from 1840 to 1844 to plans by court architect Georg Adolf Demmler, with Hermann Willebrand and Gottlieb Ruge supervising construction on the southwest bank of the Pfaffenteich. About six million wall and roof bricks came from kilns on the islands Kaninchenwerder and Ziegelwerder and at Schelffeld; the building cost 134,000 thalers. It served as an armoury, then after World War I as a police barracks, and from 1945 to July 1947 housed refugees.

The building now houses Mecklenburg-Vorpommern's Ministry of the Interior, Building and Digitalisation, a use it has had since 1990. Its ochre colour was recreated after 1991 renovations to match the original tone from the construction period. Since 2024 it has been part of Schwerin's UNESCO World Heritage Residenzensemble.

The building stands on the southwest bank of the Pfaffenteich, where it now houses the state interior ministry, so the interior is not open to visitors. The ochre facade and the two crenellated corner towers can be seen from the surrounding streets and from the lake's promenade. The Wismarsche Strasse 133 building, added to the complex, is part of the same ensemble.

The roughly six million wall and roof bricks came from brickworks on the islands of Kaninchenwerder and Ziegelwerder and at Schelffeld, now part of Schelfwerder. The whole building cost 134,000 thalers. Since 2024 it has been part of the Schwerin Residence Ensemble inscribed as UNESCO World Heritage.