Kaserne Roter Sand, Protected cultural heritage monument in Mitte, Bremen, Germany.

Kaserne Roter Sand is a four-story military building in Mitte featuring a western facade with Bremen's state coat of arms and five rounded arches at the main entrance. Today it houses multiple functions including accommodations, dining, and meeting spaces.

Built in 1925/26 to plans by Oberbaurat Hans Ohnesorge, under site supervision by Baurat Gustav Ulrich of Bremen's Hochbauamt, the barracks housed the Bremen Schutzpolizei, a militarised force formed from the Sicherheitspolizei dissolved in summer 1920 and commanded by Polizeioberst Walter Caspari. After the Bundeswehr was founded, the site passed to the Bundesmarine, which last stationed Marinefernmeldebataillon 771 here. The main building was placed under Bremen monument protection in 2009.

The building's name refers to the old Rotersand customs post at its corner. Its west facade carries the large coat of arms of the State of Bremen in the gable of the central risalit, and the main entrance sits behind a two-storey porch with five round arches. Since January 2010 the former barracks has housed the havenhostel Bremerhaven.

The building at Bürgermeister-Smidt-Straße 209, corner of Rickmersstraße, now operates as the havenhostel Bremerhaven, so the interior is not open to casual visitors. Access is for hostel guests and users of its restaurant, lounge and six seminar rooms. The main building has been a listed monument since 2009; the older remise building beside it is not protected.

The building houses a restaurant in the basement and a lounge area with recreational facilities on the ground floor. Six additional rooms are specially equipped for events and conferences.