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

• {{SMU|U-97}}, a Type U 93 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

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