Type U 23 was a class of U-boats built during World War I by the Kaiserliche Marine. Four Boats were ordered from Germaniawerft on 18 March 1911.
Design Type U 23s had an overall length of The boats' beam was , the draught was . The boats displaced when surfaced and when submerged.
Type U 23s were fitted with two Germaniawerft 6-cylinder two-stroke diesel engines with a total of for use on the surface and two SSW double-acting electric motors with a total of for underwater use. These engines powered two shafts, which gave the boats a top surface speed of , and when submerged. Cruising range was at on the surface and at submerged. Constructional diving depth was .
The U-boats were armed with four torpedo tubes, two fitted in the bow and two in the stern, and carried six torpedoes. All boats received one SK L/30 deck gun. The boats' complement was 4 officers and 31 enlisted.
Ships +Namelaunchedcommissionedmerchant ships sunk(nbr / GRT )warships sunk( nbr / tons )FateU-2312 April 191311 September 19137 / 8.822noneSunk on 20 July 1915 in the North SeaU-2424 May 19136 December 191333 / 105.7321 / 15.250Surrendered on 22 November 1918, and scrapped 1921-22 at SwanseaU-2512 July 19139 May 191421 / 14.126noneSurrendered on 23 February 1919, and scrapped 1921-22 at CherbourgU-2619 October 191320 May 19142 / 2.8493 / 10.936Sunk in September 1915 in the Baltic Sea
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