The International Union of Pure and Applied Physics (IUPAP) is a non-governmental international academic organization founded in 1922 under the auspices of the International Council of Scientific Unions (ICSU). IUPAP is a non-governmental international academic organization founded in 1922 under the umbrella of the International Council of Scientific Unions (ICSU), which receives funding. It has an executive committee and professional committees, and its congresses are held every three years.