Acronym |
Definition |
| OPSO | Osteopathic Physicians and Surgeons of Oregon |
| OPSS | Optics and Photonics Society of Singapore |
| OPTA | Organic Producers Trade Association |
| OPTA | Oklahoma Physical Therapy Association |
| OPTA | Ohio Physical Therapy Association |
| OPTA | Orthotic Prosthetic Technological Association |
| OPTMQ | Ordre Professionnel des Technologistes Medicaux du Quebec |
| ORA | Ontario Rifle Association |
| OREA | Ontario Real Estate Association |
| OREA | Oregon Retired Educators Association |
| OREP | Organization of Real Estate Professionals |
| ORHA | Ontario Residence Hall Association |
| ORR | Office of Rail Regulation |
| ORRA | Orlando Regional Realtor Associations |
| ORS | Orthopaedic Research Society |
| ORTA | Ohio Retired Teachers Association |
| OSCA | Ohio State Coroners' Association |
| OSCA | On-Site Communications Association |
| OSCA | Officine Specializate Costruzione Automobili |
| OSCC | Ontario Society of Clinical Chemists |
| OSD | Office of Supplier Diversity |
| OSGA | Off Shore Gaming Association |
| OSGA | Oregon Sheep Growers Association |
| OSIP | Organization of Spirit Industry Providers |
| OSM | Office of Strategy Managment |
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