The Matchanu-class comprised the only four submarines ever employed by the Royal Thai Navy. They were built in Japan by Mitsubishi, and were in commission from 1938 throughout the Franco-Thai War and World War II. The boats were decommissioned following the Manhattan Rebellion in 1951 and the subsequent dissolution of the navy's Submarine Group.
Unit Run[]
- HTMS Matchanu
- HTMS Wirun
- HTMS Sinsamut
- HTMS Phlai-chumphon