| Acronym | Definition |
|---|
| IOIS➣Integrated Offender Interventions Service (UK) |
| IOIS➣Interorganizational Information System |
| IOIS➣Idiopathic Orbital Inflamatory Syndrome (eye disease) |
| IOIS➣Imaging of Intrinsic Signals |
| IOIS➣Integrated Operational Intelligence System |
| IOIS➣International Organization of Information Specialists |
| IOIS➣Indian Oasis Intermediate School (Arizona) |