German submarine U-544 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II.
She was laid down at the Deutsche Werft (yard) in Hamburg as yard number 365 on 8 July 1942, launched on 17 February 1943 and commissioned on 5 May with Korvettenkapitän Willy Mattke in command.
U-544 began her service career with training as part of the 4th U-boat Flotilla from 5 May 1943. She was reassigned to the 10th flotilla for operations on 1 November.
She carried out one patrol and did not sink any ships. She was a member of five wolfpacks.
She was sunk on 16 January 1944 northwest of the Azores by American aircraft.
German Type IXC/40 submarines were slightly larger than the original Type IXCs. U-544 had a displacement of when at the surface and while submerged. The U-boat had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged. She had two shafts and two 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-544 was fitted with six torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one SK C/32 naval gun, 180 rounds, and a SK C/30 as well as a C/30 anti-aircraft gun. The boat had a complement of forty-eight.
The boat departed Kiel on 9 November 1943, moved through the North Sea, negotiated the 'gap' between Iceland and the Faroe Islands and entered the Atlantic Ocean.
She was sunk on 16 January 1944 northwest of the Azores by American aircraft from the escort carrier using rockets and depth charges.
Fifty-seven men died; there were no survivors.
U-544 took part in five wolfpacks, namely: