German submarine U-1172 was a Type VIIC/41 U-boat built for Nazi Germany's Kriegsmarine for service during World War II.

[3] The submarine was powered by two Germaniawerft F46 supercharged six-cylinder four-stroke 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) and two SSW GU 343/38-8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged.

When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph).

[3] U-1172 was one of only ten Type VIIC's to be fitted with a Balkongerät (literally 'Balcony apparatus or equipment').

The Balkongerät was an improved version of Gruppenhorchgerät (GHG) (group listening device).