| OCMA | Oakland Countys Master Appraisal 
| Others |
| OCMA | Obsessive Compulsive Music Awards
| Others |
| OCMA | Oconee Community Mentoring Association
| Others |
| OCMA | Office of Citizenship and Migration Affairs
| Others |
| OCMA | Office of Contractor Management and Administration
| Others |
| OCMA | Ohio Cast Metals Association
| Others |
| OCMA | Ohio Circulation Managers Association
| Others |
| OCMA | Ohio Coin Machine Association
| Others |
| OCMA | Ohio Community Mediation Association
| Others |
| OCMA | Ohio Concrete Masonry Association
| Others |
| OCMA | Oil Content Monitor and Analyzer
| Others |
| OCMA | Oklahoma Collegiate Media Association
| Others |
| OCMA | Ontario Colleges Mathematics Association
| Others |
| OCMA | Orange Coast Musical Arts
| Others |
| OCMA | Orange County Managers Association
| Others |
| OCMA | Orange County Medical Association
| Others |
| OCMA | Orange County Modelers Association
| Others |
| OCMA | Orange County Modelers' Association
| Others |
| OCMA | Orange County Museum of Art
| Others |
| OCMA | Orniaorange County Museum Of Art
| Others |
| OCMA | Ossining Camp Meeting Association
| Others |
| OCMA | Oxford Centre for Maritime Archaeology
| Others |
| OCMA | Oxford Centre of Maritime Archaeology
| Others |