| Abbreviation | Definition |
|---|---|
| OFS | Orange Free State |
| OFTS | Ortotombik Fransiz Topu SAKSO |
| OH | Ohio |
| OM | Oman |
| OPEC | Oil Producing and Exporting Countries |
| OPEC | Oil Producing Exporting Countries |
| OPEC | Organization for Petroleum Exporting Countries |
| OPM | One-Province Minor |
| ORP | Okret Rzeczypospolitey Polskiey (Poland) |
| P | Paraguay |
| P | Peru |
| PA | Panama |
| PAK | Pakistan |
| PAK | Panjab, Afghan, And Kashmir |
| PAMA | Pakistan Automotive Manufacturers Association |
| PAS | Philippine And Scandinavian |
| PDRK | People's Democratic Republic of Korea (North Korea) |
| PE | Peru |
| PECF | Petrochemical Exporting Countries Forum |
| PERO | Provincial Economic Review and Outlook |