Acronym |
Definition |
| OGA | New Hampshire Old Graveyard Association |
| OGA | Outdoor Guides Association |
| OGA-NA | Outdoor Guides Association of North America |
| OHE | Organization of Healthcare Educators |
| OHG | Operators Harmonization Group |
| OHPA | Oral Health Professionals Association |
| OHRIA | Ontario Horse Racing Industry Association |
| OHSM | Occupational Health and Safety Management |
| OHT | Ohio History Teachers |
| OHT | Organization of History Teachers |
| OIA | Ontario Institute of Agrologists |
| OIC | Options Industry Council |
| OIC | Open Interchange Consortium |
| OIE | Office International des Epizooties |
| OIEA | Onferenceoregon Indian Education Association |
| OIEA | Oregon Indian Education Association |
| OIML | Organisation Internationale de Métrologie Légale (International Organization of Legal Metrology) |
| OIQ | Ordre des Ingénieurs du Québec |
| OIRCA | Ontario Industrial Roofing Contractors' Association |
| OIRSA | Organismo Internacional Regional de Sanidad Agropecuaria |
| OKA | Ontario Kinesiology Association |
| OKTA | Overseas Korean Traders Associations |
| OLBPA | Old Louisville Business and Professional Association |
| OLCA | Ohio Lawn Care Association |
| OLGA | Old Ladies Golf Association |
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