OIC: Organization of the Islamic Conference
OIF: International Organization of the French-speaking World
ONUB: United Nations Operation in Burundi
OOF: other official flows
OPANAL: Agency for the Prohibition of Nuclear Weapons in Latin America and the Caribbean
OPCW: Organization for the Prohibition of Chemical Weapons
OPEC: Organization of Petroleum Exporting Countries
OSCE: Organization for Security and Cooperation in Europe
Ozone Layer Protection: Montreal Protocol on Substances That Deplete the Ozone Layer
PCA: Permanent Court of Arbitration