German submarine U-97

U-97 may refer to one of the following German submarines:


 * SMU U-97, a Type Mittel U submarine launched in 1917 and that served in the First World War until accidentally sunk on 20 November 1918 on way to surrender
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-97, a Type UB III submarine launched in 1918 and surrendered on 21 November 1918; grounded near Falmouth and broken up in situ in 1921
 * SMU UC-97, a Type UC III submarine launched in 1918 and surrendered on 22 November 1918; used as an exhibition in the United States; sunk on Lake Michigan on 7 June 1921 by gunfire from USS Wilmette


 * GS U-97 (1940), a Type VIIC submarine that served in the Second World War until sunk on 16 June 1943