| International Union of Nutritional Sciences | International Union of Official Travel Organizations | International Union of Operating Engineers | International Union of Painters and Allied Trades | International Union of Pharmacology |
| International Union of Photobiology | International Union of Police Associations | International Union of Psychological Science | International Union of Pure and Applied Biophysics | International Union of Pure and Applied Chemistry |
| International Union of Pure and Applied Physics Conference on Few Body Problems | International Union of Pure & Applied Physics | International Union of Radioecology | International Union of Radio Science | International Union of Security Officers |
| International Union of Sex Workers | International Union of Speleology | International Union of Students | International Union of Tenants | International Union of the History and Philosophy of Science |
| International Union of Theoretical and Applied Mechanics | International Union of Toxicology | international unit | International Unit | International United Webmaster's Association |
| International Unit of Purified Protein Derivative | International University Courses on Permafrost | International University Global Theatre Experience | International University in Germany | International University of Applied Sciences |
| International University of Japan | International University of Kyrgyzstan | International University of Nursing | International University of Santa Claus | International University Study Center |
| International University Theatre Association | International Upland Rice Observational Nursery | International Upland Rice Yield Nursery - Early | International Upland Rice Yield Nursery - Medium | International Urban-Wildland Interface Code |
| International Urogynecological Association | International User Group | International Utilities Revenue Protection Association | International Vacation Home Exchange | International Vacuum Electronics Conference |
| International Vacuum Electron Sources Conference | International Vacuum Microelectronics Conference | International Vacuum Nanoelectronics Conference | International Vascular Biology Meeting | International Vegetarian Union |
| International Venture Capital | International Venture Philanthropist Award | International Venture Philanthropy Award | International Ventures Japan | International Verification Methods Workshop |
| International Veterinary Academy of Pain Management | International Veterinary Acupuncture Directory | International Veterinary Acupuncture Society | International Veterinary Behavior Meeting | International Veterinary Forensic Sciences Association |
| International Veterinary Officers Council | International Veterinary Vaccines and Diagnostics Conference | International Video Conferencing Inc | International Video Corporation | International Video Gamers Association, Inc. |
| International Vintage Poster Dealer Association | International Virtual Assistants Association | International Virtual Aviation Organization | International Virtual Conferences in Veterinary Medicine | International Virtual Education Network |
| International Virtual Observatory | International Virtual Observatory Alliance | International Virtual Pilots Associations | International Virtual Private Networking | International Virtual Reality Photography Association |
| International Virtual Women's Chamber of Commerce | International Visitor | International Visitor Leadership Programme | International Visual Literacy Association | International Vitamin A Consultative Group |
| International Vocal Arts Institute | International Vocational Education and Training Association | International Vocational Qualification | International Vocational Training Organisation | International Voice Association |
| International Voice Mail Association | International Voice Messaging Association | International Voice Traffic Transit Services | International Volley Ball Federation | International Volume Purchase Agreement |
| International Voluntary Service | International Volunteer Co-Operation Organizations | International Volunteer Manager Appreciation | International Volunteer Programs Association | International Volunteers in Urology |
| International Volunteers Service Learning Programme | International Wafer Service | International Walking Horse Association | International Walk to School Day | International Warehouse Logistics Association |
| International Warehousing and Transport | International Warranty Service | International War Veterans Poetry Archives | International Wastewater Systems, Inc | International Water and Effluent Exhibition |
| International Water and Sanitation Centre | International Water History Association | International Water Law Project | International Water Levels Coalition | International Waterlily and Water Garden Society |
| International Waterlogging and Salinity Research Institute | International Waters Conference | International Water Ski Federation | International Waters Programmes Kiribati | International Water Supply Association |
| International Water Technology Association | International Water Technology Conference | International Waveform Diversity & Design Conference | International Weapons and Explosives Tracking System | International Weapon System Support System |
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