Japanese submarine I-54 may refer to one of the following submarines of the Imperial Japanese Navy:
- Japanese submarine I-54 (1926), a Kaidai-type submarine; renamed I-154 in May 1942; stricken from active duty in 1945; scuttled in 1946
- Japanese submarine I-54 (1943), an I-54-class submarine; sunk in 1944
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.