| Meaning | Category |
| Children's Online Privacy Protection Act of 1998 | Community->Law Governmental->US Government |
| Kopasker, Iceland | Regional->Airport Codes |
| Object file (Psion OPL) | Computing->File Extensions |
| Office Of Price Administration | Governmental->US Government |
| Office of Population Affairs | Governmental |
| Office of Population Affairs ( Health and Human Services) | Governmental->US Government |
| Official Police Action | Community->Law |
| Ohio Psychological Association | Business->Professional Organizations |
| Oil Pollution Act of 1990 | Governmental->Transportation |
| Oil Producers Association | Business->Professional Organizations |
| Oklahoma Psychological Association | Business->Professional Organizations |
| Online Personal Access | Internet |
| Online Privacy Alliance | Computing->Security |
| Online Publishers Association | Business->Firms |
| Operations Planning Analysis | Governmental->NASA |
| Oral Proficiency Assessment | Academic & Science->Universities |
| Oregon Pilots Association | Business->Professional Organizations |
| Oregon Psychological Association | Business->Professional Organizations |
| Oropharyngeal airway | Medical->Physiology |
| Other Principle Arterial | Business->Products |
| Other Procurement Authority | Governmental->Military |
| Other Procurement, Army | Governmental->Military Governmental->US Government |
| Outcome Purpose Action | Business->General |
| Overseas Performing Artist | Business->Positions |
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