| Order Processing Department | Business |
| Overfilling Prevention Device | Business |
| Online Professional Development | Business |
| Organizational and Professional Development | Community |
| Office of Proposal Development | Community |
| Officer Professional Development | Community |
| Operationalize Product Development | Community |
| Office of Planning and Development | Community |
| Office for Proposal Development | Community |
| Osgoode Professional Development | Community |
| Office of Professional Development | Community |
| Online Protection Database | Computing |
| Operand | Computing |
| Optical Product Development | Computing |
| Organizational Process Definition | Computing |
| Operationalized Psychodynamic Diagnosis | General |
| O Phenylenediamine Dihydrochloride | General |
| Original Pack Dispensing | General |
| Over Pressure Device | General |
| Official Procedure Descriptor | General |
| Office of Public Defense | General |
| Online Position Description | General |
| Office of the Public Defender | General |
| Office of Procurement Diversity | General |
| Optimized Process Designs | General |
| One Porsche Drive | General |
| OSHPD Preapproved Details | General |
| Oxygen Penetration Depth | General |
| Outdoor Patient Department | General |
| Office of Public Defender | General |
| Orderly Payment of Debts | General |
| Optical Proximity Detector | General |
| On Premise Diagnostics | General |
| Overcurrent Protection Device | General |
| Old Patients Department | General |
| Out Portion Department | General |
| Overfill Prevention Device | General |
| One Pedal Driving | General |
| Operator Protection Device | General |
| Office of Procurement and Diversity | General |
| Overfill Protection Device | General |
| Ohio Public Defender | General |
| Oneness Peace Divinity | General |
| Observed Point Density | General |
| Organizational Performance Dimensions | General |
| Office Products Division | General |
| Operationalisierte Psychodynamische Diagnostik | General |
| Overflow Protection Device | General |
| Obsessive Photoshop Disorder | General |
| Officer Peter Delio | General |
| Optimized Profile Descent | General |
| Obsessive Potter Disorder | General |
| Osteon Population Density | General |
| Ottawa Police Department | Governmental |
| Ontario Police Dept | Governmental |
| Overton Power District | Governmental |
| Oakland Police Department | Governmental |
| Office of Public Defence | Governmental |
| Omaha Police Department | Governmental |
| Orleans Public Defenders | Governmental |
| Oakland Police Dept | Governmental |
| Odessa Police Department | Governmental |
| Ontario Police Department | Governmental |
| Organization Planning and Discipline | Governmental |
| Orlando Police Department | Governmental |
| Orlando Police | Governmental |
| Owensboro Police Department | Governmental |
| Occupational Property Databank | Jobs |
| Obnoxious Personality Disorder | Medical |
| Officially Pronounced Dead | Medical |
| Obstructive Pulmonary Disease | Medical |
| Orphan Products Development | Medical |
| otopalatodigital | Medical |
| Office for Persons with Disabilities | Medical |
| Outpatient Department | Medical |
| Other People's Drama | Medical |
| Overfilling Prevention Devices | Medical |
| Out Patients Department | Medical |
| Optical Path Difference | Physics Related |
| Ocean Physics Department | Physics Related |
| Outsourced Product Development | Softwares |
