Type: IX-C40
Built by: AG Weser (Bremen)
Launched: 3 July 1942
Commissioned: 20 October 1942
Feldpost Nr.: M49103
Sunk: 23 April 1943
Sunk by: HMS HESPERUS (DD)
Location sunk: SW of Iceland
Position sunk: 56.45º N x 34.25º W (all hands lost, 55 men)

The only Skipper of U-191 was Kapitänleutnant Helmut Feihn. He was lost with the boat.

U-191 was attached to the 4th U-Bootflotille upon commissioning, then to the 2nd U-Bootflotille at Lorient as a frontboot (combat boat). U-191 made only one patrol, and she was lost on this first patrol while operating against a convoy in the North Atlantic.

U-191 attacked one ship during her short life and that was the 3,025-ton Norwegian steamer SCEBELI on 21 April 1943. Within two days, U-191 joined her one and only victim on the seabed.