IJN I-56 has been the name of two Japanese submarines, and may refer to:
- Japanese submarine I-156, a Kaidai-class cruiser submarine commissioned in 1929 and scuttled in 1946 before she was renumbered on 20 May 1942
- Japanese submarine I-56, a B3-class cruiser submarine commissioned in 1944 and lost in 1945
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The original article can be found at Japanese submarine I-56 and the edit history here.