JS Tenryū (ATS-4203) is a training support ship of Japan Maritime Self-Defense Force.

It is a ship for anti-aircraft shooting training support, and its main purpose is to launch and guide unmanned target aircraft.

Currently, she belongs to the 1st Maritime Training Support Corps of the Escort Fleet, and the fixed port is Kure.

On March 26, 2008, the 1st Maritime Training Support Corps was newly formed under the escort fleet and was incorporated together with JS Kurobe.

In February 2020, Master Sergeant Kazumi Sakoda was appointed as the first female SDF officer's senior corporal.