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Karl-Friedrich Merten | |
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| Born | 15 August 1905 Posen, German Empire |
| Died | 2 May 1993 (aged 87) Waldshut-Tiengen, Germany |
| Buried | Cemetery in Waldshut-Tiengen |
| Allegiance |  Weimar Republic  Nazi Germany |
| Service/ |  Reichsmarine Kriegsmarine |
| Years of service | 1928–45 |
| Rank |  Kapitän zur See |
| Commands | escort ship F-7 U-68 26th U-boat Flotilla 24th U-boat Flotilla |
| Battles/wars | Spanish Civil War
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| Awards | Knight's Cross of the Iron Cross with Oak Leaves |
Karl-Friedrich Merten (15 August 1905 – 2 May 1993) commanded the U-boat U-68 in Nazi Germany's Kriegsmarine during World War II. He received the Knight's Cross of the Iron Cross with Oak Leaves. Merten was credited with the sinking of 27 ships for a total of 170,151 gross register tons (GRT) of Allied shipping. Merten joined the Reichsmarine (navy of the Weimar Republic) in 1926. He served on the light cruisers Karlsruhe and Leipzig during the Spanish Civil War patrols.
At the outbreak of World War II, he was stationed on the battleship Schleswig-Holstein, participating in the Battle of Westerplatte and Battle of Hel. He transferred to the U-boat Arm in 1940, at first serving as a watch officer on U-38 before taking command of U-68 in early 1941. Commanding U-68 on five war patrols, patrolling in the Atlantic Ocean, the Caribbean Sea and the Indian Ocean, he was awarded Knight's Cross of the Iron Cross on 13 June 1942 and the Oak Leaves to his Knight's Cross on 16 November 1942. On the second patrol, Merten helped rescue the crews of the auxiliary cruiser Atlantis and the refuelling ship Python, which had been sunk by the Royal Navy. In January 1943 Merten became the commander of the 26th U-boat Flotilla and in March 1943, Merten was given command of the 24th U-boat Flotilla. In February 1945, he was posted to the Führer Headquarters in Berlin. At the end of the war, he was taken prisoner of war by US forces and released again in late June 1945.
After the war, Merten worked in salvaging sunken ships in the Rhine river. In November 1948, Merten was arrested by the French and accused of allegedly wrongful sinking of the French tanker Frimaire in June 1942. He was acquitted and later worked in the shipbuilding industry. Merten, who had written his memoir and books on U-boat warfare, died of cancer on 2 May 1993 in Waldshut-Tiengen, Germany.