Havnelageret (also known as Oslo Havnelager) is a commercial building located at Langkaia 1 in Oslo, Norway. The house acts partly as a headquarters for Dagbladet, but also houses Norwegian Defence Estates Agency as tenants. The building has an outside surface of concrete. The Norwegian Intelligence Service has its Source Archive there—kildearkivet. When Havnelageret was completed in 1921, it was the largest concrete building in Europe and the largest building in the Nordic countries.