During the second half of the 20th century, national goods wagon classes in Europe were increasingly replaced by Union internationale des chemins de fer (UIC) standard wagons.

In 1948, at the London Olympic Games, the UIPM (Union Internationale de Pentathlon Moderne) was founded at Sandhurst Military Academy.

In 1948, the Union Internationale de Pentathlon Moderne et Biathlon (UIPMB) was founded, to standardise the rules for biathlon and modern pentathlon.

The International Union of Architects (Union internationale des Architectes, or UIA) is an international non-governmental organization that represents over a million architects in 124 countries.

IFAJ was founded in Paris, France in 1956 as Union internationale des journalistes agricoles (UJA).

Member of the Permanent Council of the Union Internationale des Sciences Prehistoriques et Protohistoriques.

Until 1953 it was organized by the UIFAB (Union Internationale des Federations d'Amateurs de Billard).

He served as president for the Union Internationale de Pentathlon Moderne (UIPM) 1988 - 1992.

He served numerous terms as the President of the 'Union Internationale d'Histoire des Sciences' within the UNESCO.

In 1966, he founded the U.S. chapter of the UNIMA (Union Internationale de la Marionette).