| Abbreviation | Definition |
|---|---|
| IOSH | Institute Of Occupational Safety Health |
| IOSH | Institute of Occupations Safety and Health |
| IOSH | Institution of Occupation Safety and Health |
| IOSH | Institution Of Occupational Safety And Health |
| IOSH | Institution of Occupational Safety Health |
| IOSH | The Institution Of Occupational Safety Health |
| IOSR | Institute of Sound Recording |
| IOSS | Institute Of Sikh Studies |
| IOSW | Institute of social work |
| IOSW | Institute of Swiss Watchmaking |
| IOTC | Institute on the Constitution |
| IOTM | Institute of Therapeutic Massage |
| IOV | Institute of Videography |
| IOV | Institution Of Valuers |
| IPA | Institute of Practitioners in Advertising |
| IPA | Institute of Public Administration |
| IPAG | Institute for Policy Advocacy and Governance |
| IPAI | Institute of Patent Attorneys India |
| IPAK | Institute for Pure and Applied Knowledge |
| IPAN | Institute of Public Analysts of Nigeria |