Gunter Jahn (27 September 1910 – 12 April 1992) was a German U-boat commander during World War II. He was born in Hamburg, Germany and began his naval career in April 1931 as a "Seekadett". He first served on the light cruiser "Nürnberg" for more than two years, including nine patrols in the first year of the war.
In March 1941 Jahn joined the U-boat force and his first patrol was on board in September 1941. Later in November he commissioned . On his second patrol he broke through the Strait of Gibraltar and went on to become one of the most successful U-boat commanders in the Mediterranean Sea. In July 1943 he left the boat and became the commander of the 29th U-boat Flotilla. In September 1944 he fell into French captivity, where he spent nearly two years.
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