German submarine U-118 was a Type XB minelaying U-boat of Nazi Germany's Kriegsmarine during World War II.

She was ordered on 31 January 1939 and laid down on 1 March 1940 at the Friedrich Krupp Germaniawerft in Kiel, as yard number 617. She was launched on 23 September 1941 and commissioned on 6 December under the command of Korvettenkapitän Werner Czygan.

After a period of training as part of the 4th U-boat Flotilla, U-118 was assigned to the front-line as part of the 10th U-boat Flotilla on 1 October 1942. She was reassigned to the 12th U-boat Flotilla a month later on 1 November. She was a member of three wolfpacks.

U-118 sank three merchant vessels and a warship; a total of 14,064 gross register tons (GRT) and 925 tons of shipping in three patrols. She also damaged two others, for a total of 11,945 GRT.

U-118's first patrol began on 19 September 1942 with her departure from Kiel. Her route took her across the North Sea, through the 'gap' between Iceland and the Faroe Islands and into the Atlantic Ocean. The boat was attacked south of Iceland by an aircraft on 29 September which caused only slight damage. She reached her destination, Lorient, in occupied France, on 16 October.

Her second sortie was to an area between the Azores and Madeira. It was uneventful.

She carried out a short transit voyage from Lorient to Brest on 12 and 13 December 1942.

The boat's third patrol was the longest, and the most successful. Departing Brest on 25 January 1943, she sailed west of Gibraltar, where she sank Baltonia, Empire Mordred and Mary Slessor on 7 February and damaged Duero with a mine on the tenth. She was also responsible for the sinking of the corvette HMCS Weyburn on 22 February. The Canadian ship struck a mine that U-118 had laid on the first. Despite best efforts by the crew to remove depth charge primers, two exploded when the ship sank, killing men in the water and disabling a nearby destroyer. U-118 returned to France, to Bordeaux, on 26 February.

U-118 had been at sea less than a month when she was attacked by two aircraft west of the Canary Islands followed by a further eight planes from the carrier USS Bogue. Following a heavy expenditure of bombs, .50" and .30" ammunition; the U-boat exploded into two parts, oil and debris were flung into the air. 16 men survived to be picked up by the escort vessel USS Osmond Ingram.

She was sunk in position 30°49′N 33°49′W / 30.817°N 33.817°W / 30.817; -33.817

U-118 took part in three wolfpacks, namely:

• Wotan (5 – 7 October 1942)
• Westwall (28 – 30 November 1942)
• Rochen (13 – 14 February 1943)

Date	Name	Nationality	Tonnage	Fate
7 February 1943	Baltonia	United Kingdom	2,013	Sunk (Mine)
7 February 1943	Empire Mordred	United Kingdom	7,024	Sunk (Mine)
7 February 1943	Mary Slessor	United Kingdom	5,027	Sunk (Mine)
10 February 1943	Duero	Spain	2,008	Damaged (Mine)
22 February 1943	HMCS Weyburn	Royal Canadian Navy	925	Sunk (Mine)
22 February 1943	Thorsholm	Norway	9,937	Damaged (Mine)

• Hofmann, Markus. "U 118". Deutsche U-Boote 1935-1945 - u-boot-archiv.de (in German). Retrieved 6 December 2014.
• Helgason, Guðmundur. "The Type II boat U-118". German U-boats of WWII - uboat.net. Retrieved 6 December 2014.
• U-118 at ubootwaffe.net

30°49′N 28°21′W / 30.817°N 28.350°W / 30.817; -28.350