| Acronym | Definition |
|---|
| ISTI | Istituto di Scienza e Tecnologie dell'Informazione (Pisa, Italy) |
| ISTI | Institut Supérieur de Traducteurs et Interprètes (institution of higher learning for translators and interpreters) |
| ISTI | Institute of Information Science and Technologies |
| ISTI | Interfaith Sexual Trauma Institute (Saint John's University and Abbey; Collegeville, MN) |
| ISTI | Instrumental Software Technologies, Inc. (New York) |
| ISTI | Intelligent Systems Technology, Inc. |
| ISTI | International Security Training Institute (Chester, NY) |
| ISTI | Information Superiority Technology Integration |