TAMA 300 is a gravitational wave detector located at the Mitaka campus of the National Astronomical Observatory of Japan.

[1] It is a project of the gravitational wave studies group at the Institute for Cosmic Ray Research (ICRR) of the University of Tokyo.

It is officially known as the 300m Laser Interferometer Gravitational Wave Antenna due to having 300 meter long (optical) arms.

The goal of the project was to develop advanced techniques needed for a future kilometer sized interferometer and to detect gravitational waves that may occur by chance within the Local Group.

Observation of TAMA has been terminated, and work moved to the 100 m Cryogenic Laser Interferometer Observatory (CLIO) prototype in Kamioka mine.