OPANAL Organismo para la Proscripcion de las Armas Nucleares en la America Latina y el Caribe; see 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
P
PCA Permanent Court of Arbitration
PDRY People's Democratic Republic of Yemen [Yemen (Aden) or South Yemen]; used for information dated before 22 May 1990 or CY91
PFP Partnership for Peace