Aktien-Gesellschaft „Weser" was one of the major German shipbuilding companies, located at the Weser River in Bremen. Founded in 1872 it was finally closed in 1983. All together, A.G. „Weser" built about 1,400 ships of different types, including many warships. A.G. „Weser" was the leading company in the Deutsche Schiff- und Maschinenbau AG, a cooperation of eight German shipbuilding companies between 1926 and 1945.

Deutsche Schiff- und Maschinenbau Aktiengesellschaft was a cooperation of eight German shipyards in the period 1926 to 1945. The leading company was the shipyard AG Weser in Bremen.