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

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.

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 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.