OAPEC: Organization of Arab Petroleum Exporting Countries
OAS: Organization of American States
OAU: Organization of African Unity
ODA: official development assistance
OECD: Organization for Economic Cooperation and Development
OECS: Organization of Eastern Caribbean States
OIC: Organization of the Islamic Conference
OOF: other official flows
OPCW: Organization for the Prohibition of Chemical Weapons
OPEC: Organization of Petroleum Exporting Countries