German submarine U-575 was a Type VIIC U-boat in service of Nazi Germany's Kriegsmarine during World War II.

She was a member of 18 separate wolfpacks and was sunk north of the Azores by Allied ships and aircraft on 13 March 1944.

The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged.

The ship's crew abandoned their vessel in a pair of lifeboats and two rafts, but had to leave one of their number who had been trapped underneath debris.

As Winslow reached the area, she closed in on U-575 and began the tracing with depth charges, but U-575 escaped without any damage.

For many hours, U-575 hunted Astral so that she could come into a good firing position; after doing so, Captain Heydemann recognized the neutral US flag, and refrained from attacking the tanker.

At the end of January, U-575 was involved with U-123 in trying, in the mid-ocean 'air-gap', to rendezvous with the Spreewald, a German blockade runner whose doctor might be able to treat one of U123's crew members who had been injured.

[4] U-575's only target on this patrol was the Robin Hood, which she sank about 300 nautical miles (560 km; 350 mi) southeast of Nantucket Island (off the eastern US coast).

It was assumed at that time that this ship had been sunk, but she was taken in tow by the tug HMS Roode Zee to Port of Spain,[5] repaired, and returned to service in October 1943.

U-575 tallied another kill when she sank the troopship MV Abosso which was sailing unescorted about 700 nautical miles (1,300 km; 810 mi) northwest of the Azores.

One passenger, Dutch Navy submarine commander Lieutenant ter zee der 1e klasse H.C.J.

On U-575's seventh mission, she sank the US ship City of Flint from the convoy UGS 4 about 300 nmi (560 km; 350 mi) southeast of the Azores on 25 January 1943.

The fourth was longer and included an approach by a B-24 Liberator which turned away when engaged by the U-boat's anti-aircraft guns.

After sinking HMS Asphodel northwest of Cape Finisterre on 10 March, the boat was hunted for 18 hours by convoy escorts, but escaped.