International Gas Union was created in 1931.
International Astronomical Union was created in 1919.
Union of International Associations was created in 1907.
International Democrat Union was created in 1983.
International Seamen's Union was created in 1892.
International Philatelic Union was created in 1881.
International Vegetarian Union was created in 1908.
International Mathematical Union was created in 1919.
International Labor Union was created in 1878.
International Skating Union was created in 1892.
International Triathlon Union was created in 1989.
International Typographical Union was created in 1852.
Service Employees International Union was created in 1921.