Unterseeboot 20U-20
Service War Ensign of Germany (1938-1945) Kriegsmarine (Germany)
Class Type-IIB U-boat
Launched 14 January 1936
Commissioned 1 February 1937

Unterseeboot 20, or more commonly U-20 was a German Type IIB U-boat of the Kriegsmarine. She was commissioned on February 1, 1936. During the German War, she conducted operations against enemy ships. She famously sunk HMS Birmingham of the coast of the Netherlands, the first loss of life in the war.

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