List of successful U-boats contains lists of the most successful German U-boats in the two World Wars based on total tonnage.
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This list contains the 5 most successful German U-boats during the First World War based on total tonnage. Only sunk commercial vessels are included, not military (warships) nor damaged ships.
| Boat | Type | Commissioned | Total tonnage |
Ships sunk |
Patrols | Fate | Captains |
|---|---|---|---|---|---|---|---|
| SM U-35 | Type U 31 | 3 November 1914 | 539,741 | 224 | 17 | Surrendered, 26 November 1918 | Waldemar Kophamel Lothar von Arnauld de la Perière Ernst von Voigt Heino von Heimburg |
| SM U-39 | Type U 31 | 13 January 1915 | 404,478 | 154 | 19 | Surrendered, 22 March 1919 | Hans Kratzsch Walter Forstmann Heinrich Metzger |
| SM U-38 | Type U 31 | 15 December 1914 | 299,985 | 137 | 17 | Surrendered, 23 February 1919 | Max Valentiner Wilhelm Canaris Hans Heinrich Wurmbach Clemens Wickel |
| SM U-34 | Type U 31 | 5 October 1914 | 262,886 | 121 | 17 | Missing, 9 November 1918 | Claus Rücker Wilhelm Canaris Johannes Klasing |
| SM U-33 | Type U 31 | 27 September 1914 | 229,598 | 84 | 16 | Surrendered, 16 January 1919 | Konrad Gansser Gustav Sieß Hellmuth von Doemming |
This list contains the 10 most successful German U-boats during the Second World War based on total tonnage. Both commercial and military vessels (warships) are included but only sunk ships are included, not damaged ships.
| Boat | Type | Commissioned | Total tonnage |
Ships sunk |
Patrols | Fate | Captains |
|---|---|---|---|---|---|---|---|
| U-48 | VIIB | 22 April 1939 | 307,935 | 52 | 12 | Scuttled, 3 May 1945 | Herbert Schultze Hans-Rudolf Rösing Heinrich Bleichrodt |
| U-99 | VIIB | 18 April 1940 | 244,658 | 38 | 8 | Scuttled, 17 March 1941 after depth charging by HMS Walker. | Otto Kretschmer |
| U-103 | IXB | 18 April 1940 | 237,596 | 45 | 11 | Decommissioned March 1944. Sunk by bombs in Kiel, 15 April 1945. | Viktor Schütze Werner Winter |
| U-124 | IXB | 11 June 1940 | 224,953 | 48 | 11 | Lost with all hands, 2 April 1943 after depth charging by HMS Stonecrop and HMS Black Swan. | Georg-Wilhelm Schulz Johann Mohr |
| U-123 | IXB | 30 May 1940 | 223,816 | 44 | 12 | Decommissioned June 1944. Scuttled in port, 19 August 1944. Refloated and taken into French service as Blaison. | Karl-Heinz Moehle Reinhard Hardegen Horst von Schroeter |
| U-107 | IXB | 8 October 1940 | 217,786 | 39 | 14 | Lost with all hands 18 August 1944 after depth charging by a Sunderland of 201 Squadron RAF. | Günter Hessler Harald Gelhaus Volker Simmermacher Karl-Heinz Fritz |
| U-37 | IX | 4 August 1938 | 202,528 | 55 | 11 | Scuttled, 8 May 1945 | Heinrich Schuch Werner Hartmann Victor Oehrn Asmus Nicolai Clausen Ulrich Folkers |
| U-66 | IXC | 20 March 1940 | 200,021 | 33 | 12 | Sunk 6 May 1944 by Wildcats and Avengers of USS Block Island, rammed by destroyer escort USS Buckley. | Richard Zapp Friedrich Markworth Paul Frerks Gerhard Seehausen |
| U-68 | IXC | 11 February 1941 | 197,998 | 33 | 10 | Sunk 10 April 1944, depth charges and rockets fired by Wildcats and Avengers of USS Guadalcanal. | Karl-Friedrich Merten Albert Lauzemis Ekkehard Scherraus Gerhard Seehausen Albert Lauzemis |
| U-47 | VIIB | 17 December 1938 | 191,919 | 31 | 10 | Missing with all hands, on or about 7 March 1941 while patrolling south of Iceland between 59 deg and 62 deg north. Depth charged by destroyers HMS Wolverine and HMS Verity after being located using Type 286 ASDIC newly fitted to both destroyers. | Günther Prien |
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