List of active ships of the Japan Maritime Self-Defense Force is a list of ships in active service with the Japan Maritime Self-Defense Force.The JMSDF is one of the world's largest navies and the second largest navy in Asia in terms of fleet tonnage. As of 2022, the JMSDF operates a total of 155 vessels (including minor auxiliary vessels), including; four helicopter destroyers (or helicopter carriers), 36 destroyers, 10 small destroyers (or frigates), two frigates, six destroyer escorts (or corvettes), 22 attack submarines, 30 mine countermeasure vessels, six patrol vessels, three landing ship tanks, 8 training vessels and a fleet of various auxiliary ships.