German submarine U-113

U-113 may refer to one of the following German submarines:


 * SMU U-113, a Type Mittel U submarine launched in 1917 that served in the First World War and was surrendered in 1918
 * During the First World War, Germany also had this submarine with a similar name:
 * SMU UB-113, a Type UB III submarine launched in 1917 and disappeared in 1918


 * GS U-113 (1939), would have been a Type XIB submarine, a large cruiser-type submarine capable of carrying an Arado Ar 231 aircraft; laid down in 1939, but cancelled after the outbreak of the Second World War