KMS U-889 was a Type IX U-Boat of the Nazi Kriegsmarine during World War II. U-889 was laid down on 13 September 1943 at the AG Weser shipyard in Bremen and was commissioned on 4 August 1944, with 'Kapitänleutnant (Lieutenant) Friedrich Braeucker as commander. Until 14 March 1945 she was attached to 4th U-boat Flotilla for training. She was then assigned to 33rd U-boat Flotilla, a combat unit based at Flensburg. Her first, and only, active patrol started on 15 March 1945.
U-889 sank no vessels before the war in Europe ended, and subsequently surrendered to a Canadian patrol. She was commissioned into the Royal Canadian Navy as HMCS U-889, and served under the RCN until 1958, first as a combat ship and later as an anti-submarine warfare training ship. After being decommissioned, she was turned into a museum ship in RCNB Protector.