Institute of Space and Astronautical Science (ISAS) is a Japanese national research organization of astrophysics using rockets, astronomical satellites and interplanetary probes.
Since 2003, it is a division of Japan Aerospace Exploration Agency (JAXA).
In 2003, three national aerospace organizations including ISAS were merged to form Japan Aerospace Exploration Agency (JAXA). The ISAS English name 'Institute of Space and Astronautical Science' is still used (as of April 2014).