German submarine U-111

U-111 may refer to one of the following German submarines:


 * SMU U-111, 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-111, a Type UB III submarine launched in 1917 and was surrendered in 1918


 * GS U-111 (1940), a Type IXB submarine that served in the Second World War and sank in 1941