I-165 was a Kaidai-class V submarine of the Imperial Japanese Navy during World War II. Built at the Kure Naval Arsenal laid down as I-65 on 19 December 1929, launched on 2 June 1931 and completed on 1 December 1932. She was redsignated I-165 on 20 May 1942. Converted to a Kaiten mother ship, she was sunk by a United States Navy patrol bomber on 27 June 1945 in the Mariana Islands at 15°28′N 153°39′E.