| OHASA | Occupational Health and Safety Act 
| Others |
| OHASA | Occupational Health And Safety Assessment
| Others |
| OHASA | Occupational Hygiene Association of South Africa
| Others |
| OHASA | One Health Alliance of South Asia
| Others |
| OHASA | Oral History Association of South Afica
| Others |
| OHASA | Oral History Association of South Africa
| Others |
| OHASA | Oral Hygienists Association of South Africa
| Others |
| OHASA | Oral Hygienists' Association of South Africa
| Others |