| Acronym | Definition |
|---|
| ISOI➣International School of Islamabad (Pakistan) |
| ISOI➣Instrument Society of India (est. 1970) |
| ISOI➣Istituto Sull Orticoltura Industriale (Italian: Horticulture Industry Institute; Bari, Italy) |
| ISOI➣Internet Security and Operational Intelligence |