German submarine U-434

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German submarine U-434 was a Type VIIC U-boat of the German Kriegsmarine during World War II.

The U-boat was laid down on 20 January 1940 at the Schichau-Werke yard, Danzig, launched on 15 March 1941, and commissioned on 21 June 1941, Kapitänleutnant Wolfgang Heyda commanding.

U-434 sailed from Kristiansand, Norway on 2 November 1941, on her first and only war patrol. On 18 December, U-434 was sunk in the North Atlantic north of Madeira, Portugal, in position 36.15N, 15.48W. The U-boat was forced to the surface by depth charges from the British escort destroyer HMS Blankney (L30) and the destroyer HMS Stanley (I73). There were 2 dead and 42 survivors.