German submarine U-721

German submarine U-721 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 16 November 1942 at the H. C. Stülcken Sohn yard at Hamburg, launched on 23 July 1943, and commissioned on 8 November 1943 under the command of Oberleutnant zur See Otto Wollschläger.

Fate
Scuttled on 4 May 1945 in Geltinger Bucht as part of Operation Rainbow. Later raised and broken up for scrap.