| 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) |