- Amalgamated Union of Engineering
- Asian Clearing Union
- Banking, Insurance and Finance Union
- Consumers Union
- Engineering Unions
- European Union for Wholesale Potato Trade
- European Cattle and Meat Trade Union
- European Payments Union
- International Union for Land Value Taxation and Free Trade
- International Union for the Conservation of Nature and Natural Resources
- International Union for the Scientific Study of Population
- International Union of Agricultural Sciences
- International Union of Family Organizations
- International Union of Food and Allied Workers
- International Union of Tenants
- International Population Union
- International Telecommunication Union
- Latin Monetary Union
- National Agricultural Workers' Union
- National Farmers Union
- National Taxpayers' Union
- Scandinavian Monetary Union
- Transport and General Workers' Union
- Universal Postal Union