German submarine U-4703 was a Type XXIII U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 7 July 1944, and was laid down on 1 November 1944 at Friedrich Krupp Germaniawerft AG, Kiel, as yard number 945. She was launched on 3 January 1945 and commissioned under the command of Oberleutnant zur See Hans-Ulrich Scholz on 21 January 1945.
Like all Type XXIII U-boats, U-4703 had a displacement of when at the surface and while submerged. She had a total length of (o/a), a beam width of (o/a), and a draught depth of . The submarine was powered by one MWM six-cylinder RS134S diesel engine providing , one AEG GU4463-8 double-acting electric motor electric motor providing , and one BBC silent running CCR188 electric motor providing .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, the boat could operate at for ; when surfaced, she could travel at . U-4703 was fitted with two torpedo tubes in the bow. She could carry two preloaded torpedoes. The complement was 14âÂÂ18 men. This class of U-boat did not carry a deck gun.
On 5 May 1945, U-4703 was scuttled in Gelting Bay near Gelting, as part of Operation Regenbogen. The wreck was later raised and broken up.