Südseehaus, Commercial office building in Hamburg-Altstadt, Germany

The Südseehaus is a commercial office building in Hamburg's Altstadt district featuring four characteristic gables across its facade. It stands at the intersection of Mönckebergstraße, Lange Mühren, and Spitalerstraße and now houses a major department store.

Construction completed in 1911 under architect Carl Gustav Bensel with 54 office units and retail spaces. The structure survived the heavy air raids on Hamburg in 1943 and underwent major renovation work afterward.

The name Südseehaus comes from the South America business of co-owner Eduard Hurry Ringel, not from the South Seas. Early tenants included Schlubach & Co. and the Mittelamerikanische Plantagen AG, and the ground-floor shops were let to textile and food retailers such as Ernst von Spreckelsen. Since 1949 Peek & Cloppenburg has occupied the building.

The Südseehaus occupies the block between Mönckebergstraße, Spitalerstraße and Lange Mühren, a few minutes' walk from Hamburg Hauptbahnhof. The Mönckebergstraße U-Bahn station lies directly in front of the building. The surrounding streets are pedestrian zones, so the address is reached on foot rather than by car.

The four gables that defined the original facade were removed in 1958 and replaced by two setback storeys, the upper one clad in copper and topped with a pergola. The building's name comes from its first tenants' South America trade, not from the South Seas.