OHSI
| Acronym | Definition |
|---|---|
| OHSI | Occupational Hygiene Society of Ireland (est. 1986) |
| OHSI | Olathe Health System, Inc. (Kansas) |
| OHSI | Occupational Health Service Institute |
| OHSI | Oral Health Status Index (dentistry) |
| OHSI | One Hundred Services, Inc. (Makati City, Philippines) |