U-105 may refer to one of the following German submarines:
, a Type U 93 submarine launched in 1917 that served in the First World War, and surrendered in 1918; became French submarine Jean Autric. During the First World War, Germany also had these submarines with similar names: , a Type UB III submarine launched in 1917 and surrendered in 1919. , a Type UC III submarine launched in 1918 and surrendered the same year. , a Type IXB submarine that served in the Second World War and was sunk in 1943.