The Mashū-class is a series of replenishment oilers of the Japan Maritime Self-Defense Force (JMSDF).

The ships have the hull designator AOE.

[1] The Mashū-class was designed as an enlarged, improved version of the Towada-class fast combat support ships.

The vessels are capable of mounting two Phalanx CIWS by design.

They have been in commission from 2004 onwards.