Organizations

Oakland Institute

Observatorio Sismológico del SurOccidente (OSSO)

Oceania Customs Organisation Secretariat (OCO)

Ockenden International (OI)

ODI - Humanitarian Policy Group (ODI - HPG)

ODI - Humanitarian Practice Network (ODI - HPN)

Offene Arme e.V.

Office of the High Representative in Bosnia and Herzegovina (OHR)

Office of the Special Coordinator for Development in the Sahel (OSCDS)

Office of the UN Special Coordinator for Lebanon (UNSCOL)

Ofiriha

Ogaden Welfare Society (OWS)

OIDHACO

OIKOS - Cooperação e Desenvolvimento (OIKOS)

One World Trust

OneWorld International Foundation (OWIF)

Ooredoo

OPEC Fund for International Development (OFID)

Open Data Watch

Open Media Research Institute (OMRI)

OPEN Perspectives Exchange Network (OPEN) (OPEN)

Open Society Foundations

Operation Blessing (OBI)

Operation Mercy

Operation USA

Orange

ORBIS International (ORBIS)

Orchid Project

Organisation for Economic Co-operation and Development (OECD)

Organisation for the Prohibition of Chemical Weapons (OPCW)

Organisation internationale de la Francophonie (La Francophonie)

Organisation of African, Caribbean and Pacific States (OACPS)

Organisation of Eastern Caribbean States (OECS)

Organisation of Islamic Cooperation (OIC)

Organization for Refuge, Asylum and Migration (ORAM)

Organization for Security and Co-operation in Europe (OSCE)

Organization of American States (OAS)

Orient for Human Relief

Orissa Disaster Mitigation Mission (ODMM)

Orthodox Metropolitanate of Hong Kong and Southeast Asia (OMHKSEA)