The International Nuclear Safety Advisory Group (INSAG) is a group of experts with high professional competence in the field of nuclear and radiation safety and experience of working in regulatory organizations, nuclear industry, technical support organisations, research or academic institutions.

INSAG is convened by the International Atomic Energy Agency (IAEA) with the objective of providing the Director General of the IAEA with authoritative advice and recommendations on current and emerging issues in nuclear and radiation safety approaches, policies and principles. INSAG addresses fundamental safety issues as well as current and emerging matters of importance relevant to the nuclear and radiation safety of all facilities and activities, including nuclear security issues insofar as they relate to nuclear and radiation safety. The group was created by the IAEA Director General in 1985.