German submarine U-733

German submarine U-733 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 15 October 1941 at the Schichau-Werke yard at Danzig, launched on 5 September 1942, and commissioned on 14 November 1942 under the command of Oberleutnant zur See Wilhelm von Trotha.

Service history
On 8 April 1943, U-733 collided with Vorpostenboot V 313 outside Gotenhafen port and sank without fatalities. The next week, U-733 was raised and repaired in the Schichau yard. On 15 December 1943, U-733 was re-commissioned under the command of Oblt.z.S. Hans Hellmann. In May 1945, U-733 transferred to Flensburg, were the U-boat was attacked by US aircraft and scuttled after receiving heavy damage.