| International Agency for Research on Cancer | Internationale Agentur für Krebsforschung |
| International Air Transport Association | International Air Transport Association |
| International Auxiliary Language Association | International Auxiliary Language Association |
| International Baccalaureate Diploma Programme | International Baccalaureate |
| International Bank Account Number | International Bank Account Number |
| International Boxing Federation | International Boxing Federation |
| International Chamber of Commerce | Internationale Handelskammer |
| International Civil Aviation Organization | International Civil Aviation Organization |
| International Code of Botanical Nomenclature | Internationaler Code der Botanischen Nomenklatur |
| International Cricket Council | International Cricket Council |
| International Data Group | International Data Group |
| International Democrat Union | Internationale Demokratische Union |
| International Electrotechnical Commission | International Electrotechnical Commission |
| International Federation of PGA Tours | International Federation of PGA Tours |
| International Handball Federation | International Handball Federation |
| International Hockey League | International Hockey League |
| International Labour Organization | Internationale Arbeitsorganisation |
| International Lesbian and Gay Association | International Lesbian and Gay Association |
| International Maritime Organization | Internationale Seeschifffahrts-Organisation |
| International Mobile Subscriber Identity | International Mobile Subscriber Identity |
| International Music Score Library Project | International Music Score Library Project |
| International Phonetic Association | International Phonetic Association |
| International Security Assistance Force | ISAF |
| International Standard Book Number | Internationale Standardbuchnummer |
| International Standard Serial Number | International Standard Serial Number |
| International style | Internationaler Stil |
| International Superstar Soccer | International Superstar Soccer |
| International Tchaikovsky Competition | Tschaikowsky-Wettbewerb |
| International Telephone and Telegraph | International Telephone and Telegraph |
| International Tennis Federation | International Tennis Federation |
| International Tennis Hall of Fame | International Tennis Hall of Fame |
| International Union of Socialist Youth | International Union of Socialist Youth |
