German submarine U-1191 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.
The U-1191 was laid down on 4 November 1942 at the F Schichau shipyard in Danzig, Poland. She was launched on 6 July 1943 and commissioned on 9 September 1943 under the command of Oberleutnant zur See Peter Grau.
When she was completed, the submarine was long, with a beam of , a height of and a draft of . She was assessed at submerged. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced and two AEG GU 460/8-276 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The submarine was capable of operating at depths of up to , had a maximum surface speed of and a maximum submerged speed of .When submerged, the U-boat could operate for at and when surfaced, she could travel at .
The submarine was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one deck gun (220 rounds), one Flak M42 and two twin C/30 anti-aircraft guns. The boat had a complement of 44 to 57 men.
U-1191 was used as a Training ship in the 8th U-boat Flotilla from 9 September 1943 until 30 April 1944, before serving in the 7th U-boat Flotilla for active service on 1 May 1944. She was fitted with a Schnorchel underwater-breathing apparatus in April 1944.
During her active service, U-1191 made 1 patrol. She left Stavanger with 50 crew on 22 May 1944 for her first patrol and patrolled the North Atlantic, North of the Faroe Islands, West off the coast of Ireland and northwest of France.
On 3 July 1944 during her patrol in the English Channel, U-1191 was sunk by depth charges from the British frigates and southwest of Brighton, England, ending her first and only patrol during World War II after 43 days. All 50 crew members on board were lost. She was first listed as missing and it was thought that she had been sunk by a mine or by human error instead of by depth charges. In total U-1191 spent 50 days at sea.
The wreck of U-1191 was located in 1995 at a depth of and lay in nearly the same position as , which was sunk only days before U-1191s demise. The wreck is located at .