| Abbreviation | Definition |
|---|---|
| OHPS | Ojibway Historical Preservation Society |
| OHPS | Old Hastings Preservation Society |
| OHS | Oklahoma Historical Society |
| OHS | Oregon Historical Society |
| OHSI | Occupational Hygiene Society of Ireland |
| OIBPA | International Union for Pure and Applied Biophysics |
| OIBPA | Organisation Internationale de Biophysique Pure et Applique |
| OIBPA | Organisation Internationale de Biophysique Pure et Appliquée |
| OIGS | Old Irish Goat Society |
| OIML | International Organization of Legal Metrology |
| OIML | Organisation Internationale de Métrologie Légale |
| OIML | Organisation Internationale de Mtrologie Lgale |
| OIML | Organizacin Internacional de Metrologa Legal |
| OIML | Organización Internacional de Metrología Legal |
| OIRC | International Brain Research Organization |
| OIRC | International Cell Research Organization |
| OIRC | Organisation Internationale de Recherche sur la Cellule |
| OIRC | Organisation Internationale de Recherche sur le Cerveau |
| OLGdW | Oberlausitzische Gesellschaft der Wissenschaften |
| OLGdW | Upper-Lusatian Society of Sciences |