The Union Mundial Pro Interlingua (World Interlingua Union), or UMI, is a global organization that promotes Interlingua, an international auxiliary language (IAL) published in 1951 by the International Auxiliary Language Association (IALA). UMI was founded on July 28, 1955, when the first International Interlingua Congress took place in Tours, France. The UMI collaborates with the national Interlingua organizations and has a hand in publishing dictionaries, grammars and tutorials. It is a non-profit organization that now operates out of Bilthoven, Netherlands.