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| OA (O/A) | Open Account |
| OA | Official Aid |
| OAS | Organization of American States |
| ODA | Official Development Assistance |
| OE | Oil Equivalent |
| OECD | Organization for Economic Cooperation and Development |
| OECS | Organisation of Eastern Caribbean States |
| OED | Operations Evaluation Department (World Bank) |
| OEEC | Organization for European Economic Cooperation |
| OEM | Original Equipment Manufacturer |
| OFAC | Office of Foreign Assets Control, U.S. Department of the Treasury |
| OMA | Orderly Marketing Agreement |
| OOF | Other official flows |
| OPEC | Organization of Petroleum Exporting Countries |
| OPIC | Overseas Private Investment Corporation (United States) |
| OPIC | Overseas Private Investment Corporation |
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