German submarine U-889 was a Type IXC/40 U-boat of Nazi Germany's Kriegsmarine during World War II.

The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of 4,400 metric horsepower (3,240 kW; 4,340 shp) for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1,000 shaft horsepower (1,010 PS; 750 kW) for use while submerged.

U-889 was laid down on 13 September 1943 at the DeSchiMAG AG Weser shipyard in Bremen and was commissioned on 4 August 1944, with Kapitänleutnant Friedrich Braeucker (Crew IV/37) as commander.

On the afternoon of 10 May, U-889 was spotted south of Newfoundland by a RCAF airplane, steaming at 10 knots and flying a black flag of surrender.

The RCAF plane radioed to nearby Western Escort Force W-6 who intercepted the submarine an hour later.

U-889 was one of ten U-boats allocated to the United States as part of the Tripartite Naval Commission sitting in Berlin in November 1945.