German submarine U-1235 was a Type IXC/40 U-boat of the German Kriegsmarine during World War II. The submarine was laid down on 25 May 1943 at the Deutsche Werft yard at Hamburg, launched on 25 January 1944, and commissioned on 17 May 1944. She served with 31st U-boat Flotilla (31st U-Boat Flotilla), a training unit, and with 33rd U-boat Flotilla from 1 December 1944 to 15 April 1945.