German submarine U-1191 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.

She was launched on 6 July 1943 and commissioned on 9 September 1943 under the command of Oberleutnant zur See Peter Grau.

The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced and two AEG GU 460/8-276 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged.

[2] On 3 July 1944 during her patrol in the English Channel, U-1191 was sunk by depth charges from the British frigates HMS Affleck and HMS Balfour southwest of Brighton, England, ending her first and only patrol during World War II after 43 days.

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.