AAPSO
...Solidarity Organization organization

CENTO
Central Treaty Organization

charitable
charitable organization

CSIRO
...Research Organization organization

ELDO
European Launch Development Organization

ESRO
European Space Research Organization

FAO
Food and Agriculture Organization

humanitarian
humanitarian organization

ICAO
...Aviation Organization organization

ILO
International Labour Organization

IMCO
...Consultative Organization organization

Intelsat
...Satellite Organization organization

Interpol
...Police Organization organization

IOGT
...Good Templars organization

IOM
International Organization for Migration

IRO
International Refugee Organization

ISO
International Standards Organization

ITO
International Trade Organization

NATO
North Atlantic Treaty Organization

NGO
nongovernmental organization

OAU
Organization of African Unity

OPEC
Organization of Petroleum Exporting Countries

organization
...in the organization of a new club

SEAMEO
...Education Organization organization

SEATO
Southeast Asia Treaty Organization

UNIDO
...Development Organization organization

UNO
United Nations Organization

WHO
World Health Organization

WMO
World Meteorological Organization

WTO
World Trade Organization