German submarine U-174 was a Type IXC U-boat of the Nazi German Kriegsmarine during World War II. She was laid down at the AG Weser yard in Bremen as 'werk' 1014 on 2 January 1941, launched on 21 August and commissioned on 26 November with Fregattenkapitän Ulrich Thilo in command. U-174 began her service career with training as part of the 4th U-boat Flotilla. She was re-assigned to the 10th flotilla for operations on 1 August 1942. She was sunk by an American Lockheed Ventura in April 1943.