Amagi (天城, Heavenly Castle) was a screw sloop in the early Imperial Japanese Navy, and was the third vessel built by the Yokosuka Naval Arsenal after its acquisition by the Meiji government.

Amagi was designed as a wooden-hulled three-masted bark-rigged sloop with a coal-fired triple expansion reciprocating steam engine driving a single screw.

Made mostly of pine wood, the wooden beams and metal fittings came from the mountains of central Izu Peninsula, which also provided the ship with its name.

With heightened tensions with Joseon dynasty Korea after the assassination of several members of the Japanese embassy in the Imo Incident, Amagi was assigned to patrols off the Korean coast as a show of force in the summer of 1882, with Lieutenant Tōgō Heihachirō as executive officer.

After the war, Amagi was re-designated as a second-class gunboat, and was used for coastal patrol duties.