German submarine U-651

German submarine U-651 was a German Type VIIC U-boat built for the German Kriegsmarine for service during World War II. She was ordered just after the war started in 1939, laid down on 16 January 1940, launched in December that year and commissioned the following February. She was commanded by Kapitänleutnant Peter Lohmeyer.

Her career was a short one. She took part in only one patrol and sunk two ships in convoy Convoy HX 133: the merchantmen SS Brockley Hill and SS Grayburn. She was sunk by the escort for the same convoy but 45 of her crew were rescued by the Royal Navy and interrogated by the Admiralty.