| Abbreviation | Definition |
|---|---|
| ISTE | International Society for Teacher Education |
| ISTM | International Society of Travel Medicine |
| ISTM | Irish Society of Travel Medicine |
| ISTP | International Society for Theoretical Psychology |
| ISVTT | IndoSwiss Vocational Training Trust |
| ITAA | Information Technology Association of America |
| ITAA | International Textiles and Apparel Association |
| ITAA | International Transactional Analysis Association |
| ITAA | Iowa Textile and Apparel Association |
| ITACCS | International Trauma, Anaesthesia, and Critical Care Society |
| ITC | Industrial Training Council |
| ITC | Industry Technical Committee |
| ITC | Information Technology Charlotte |
| ITCA | International Topper Class Association |
| ITCA | International Toy Collectors Association |
| ITEA | Illinois Truck Enforcement Association |
| ITEME | Institution of Technician Engineers in Mechanical Engineering |
| ITFA | International Trade And Finance Association |
| ITG | Institut du Temps Géré |
| ITG | Institute of Tourist Guiding |