List of nuclear research reactors

This article is about nuclear fission research reactors. For fusion research reactor lists, see List of nuclear reactors. For commercial power reactors, see List of commercial nuclear reactors and List of nuclear power stations.

This is an annotated list of all the nuclear fission-based nuclear research reactors in the world, sorted by country, with operational status. Some "research" reactors were built for the purpose of producing material for nuclear weapons.

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.