Harburg-Wilhelmsburg was a city in the Prussian Province of Hanover briefly in existence from 1927 and 1937, resulting from the merger of the cities of Harburg and Wilhelmsburg. In 1937, Harburg-Wilhelmsburg, along with the cities from the Prussian Province of Schleswig-Holstein, Altona and Wandsbek, is annexed to Hamburg in the Greater Hamburg Act. Despite its incorporation into Hamburg, Harburg continued to be the district capital of the Hanoverian district of Harburg.