German submarine U-660 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II.She was laid down on 15 February 1941 by Howaldtswerke, Hamburg as yard number 809, launched on 17 November 1941 and commissioned on 8 January 1942 under Oberleutnant zur See Götz Baur.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-660 had a displacement of 769t when at the surface and 871t while submerged. She had a total length of 67.1m (220.1feet), a pressure hull length of 50.5m (165.7feet), a beam of 6.2m (20.3feet), a height of 9.6m (31.5feet), and a draught of 4.74m (15.55feet). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of NaNPS for use while surfaced, two Siemens-Schuckert GU 343/38–8 double-acting electric motors producing a total of 750PS for use while submerged. She had two shafts and two 1.23abbr=onNaNabbr=on propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . U-660 was fitted with five 53.30NaN0 torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.82NaN2 SK C/35 naval gun, 220 rounds, and a 2sp=usNaNsp=us C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.
The boat's career began with training at 5th U-boat Flotilla on 8 January 1942, followed by active service on 1 August 1942 as part of the 9th Flotilla. Later, on 1 November 1942, she transferred to operations in the Mediterranean with 29th Flotilla where she served for the remainder of her service.
In 3 patrols she sank 2 merchant ships, for a total of, and damaged 2 others.
U-660 took part in four wolfpacks, namely:
U-660 was sunk on 12 November 1942 in the Mediterranean in position 36.1167°N -1°W, after sustaining damage by depth charges from and .
| Date | Ship Name | Nationality | Tonnage (GRT) | Fate[1] | |
|---|---|---|---|---|---|
| 10 August 1942 | Condylis |  Greece | 4,439 | Damaged | |
| 10 August 1942 | Cape Race |  United Kingdom | 3,807 | Sunk | |
| 10 August 1942 | Empire Reindeer | United Kingdom | 6,259 | Sunk | |
| 10 August 1942 | Oregon | United Kingdom | 6,008 | Damaged |