German submarine U-30

U-30 may refer to one of the following German submarines:

• , was a Type U 27 submarine launched in 1913 and that served in the First World War until surrendered on 22 November 1918
• During the First World War, Germany also had these submarines with similar names:
• , a Type UB II submarine launched in 1915 and sunk on 13 August 1918
• , a Type UC II submarine launched in 1916 and sunk on 21 April 1917
• , a Type VIIA submarine that served in the Second World War until scuttled on 4 May 1945
• , a Type 206 submarine of the Bundesmarine that was launched in 1975