The KSTAR (or Korea Superconducting Tokamak Advanced Research; Korean: 초전도 핵융합연구장치, literally "superconductive nuclear fusion research device")[1] is a magnetic fusion device at the Korea Institute of Fusion Energy in Daejeon, South Korea.

It is intended to study aspects of magnetic fusion energy that will be pertinent to the ITER fusion project as part of that country's contribution to the ITER effort.

The project was approved in 1995, but construction was delayed by the East Asian financial crisis, which weakened the South Korean economy considerably; however, the project's construction phase was completed on September 14, 2007.

The experiment will use both hydrogen and deuterium fuels but not the deuterium-tritium mix which will be studied in ITER.

Beginning in December 2016, KSTAR would repeatedly hold the world record (longest high-confinement mode) by confining and maintaining a hydrogen plasma at a higher temperature and for a longer time than any other reactor.