German submarine U-739

German submarine U-739 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 17 April 1942 by F Schichau GmbH, Danzig as yard number 1536, launched on 23 December 1942 and commissioned on 6 March 1943 under Leutnant zur See Ernst Mangold.

Service History
The boat's career began with training at 8th U-boat Flotilla on 6 March 1943, followed by active service on 1 November 1943 as part of the 9th Flotilla. Just two months later she transferred to 13th Flotilla for the remainder of her service.

In 8 patrols she sank 1 warship for a total of 625 tons.

Wolfpacks
U-739 took part in eight wolfpacks, namely
 * Isegrim (16–27 January 1944)
 * Werwolf (27 January - 2 February 1944)
 * Boreas (28 February - 5 March 1944)
 * Keil (16–20 April 1944)
 * Donner & Keil (20 April - 3 May 1944)
 * Trutz (7–10 July 1944)
 * Greif (5 August - 26 September 1944)
 * Rasmus (6–13 February 1945)

Fate
U-739 surrendered on 13 May 1945 at Emden. Sunk later on 16 December 1945, in position 58.33333°N, -31.86667°W in Operation Deadlight.