| Occupied territories See:Military occupation |
| Ocean - Environmental aspects - Congresses |
| Ocean Conference, United Nations, New York, 5-9 JUne 2017 |
| Ocean bottom |
| International Seabed Authority (ISA) |
| Ocean conservation See:Marine resources conservation |
| Ocean currents - Atlantic Ocean |
| Benguela Current Commission Established in 2007 by signing of an interim agreement between Namibia, Angola and South Africa. The Benguela Current Convention was signed on 18 March 2013. |
| Ocean policy See; Marine resources - Government policy |
| Ocean temperature - Indian Ocean |
| Australia. Bureau of Meteorology. About the Indian Ocean Dipole (IOD) |
| Ocean temperature - Pacific Ocean |
| Australia. Bureau of Meteorology. El Niño Southern Oscillation (ENSO) |
| Oceanography |
| Intergovernmental Oceanographic Commission (IOC) |
| Ocean Observations Panel for Climate (OOPC) "a scientific expert advisory group charged with making recommendations for a sustained global ocean observing system for climate." |
| OceanDocs: Repository of Ocean Publications "OceanDocs is supported by the Intergovernmental Oceanographic Commission (IOC) to collect, preserve and facilitate discovery and access to all research output from members of the ocean research and observation community and specifically their Ocean Data and Information Networks (ODINS)." |
| Oceanography and state - European Union countries |
| Joint Programming Initiative Healthy and Productive Seas and Oceans (JPI Oceans) "established in 2011 as a coordinating and integrating strategic platform, open to all EU Member States and Associated Countries who invest in marine and maritime research. JPI Oceans covers all European sea basins with 21 participating countries and provides a long-term integrated approach to marine and maritime research and technology development in Europe." |
| Oceans - Research - Government policy See: Oceanography and state |
| Offences against the environment - Nigeria |
| National Environmental Standards and Regulations Enforcement Agency (NESREA) Parastatal of the Federal Ministry of Environment, Housing and Urban Development. |
| Oil industries - Statistics |
| Joint Oil Data Initiative (JODI) |
| Oil spills |
| Global Initiative for West, Central and Southern Africa (GI WACAF Project) "Launched in 2006, the Global Initiative for West, Central and Southern Africa (GI WACAF) Project is a collaboration between the International Maritime Organization (IMO) and IPIECA, the global oil and gas industry association for environmental and social issues, to enhance the capacity of partner countries to prepare for and respond to marine oil spills." |
| National Oil Spill Contingency Plans (NOSCP) |
| Okavango River Basin |
| OKACOM. Environmental Protection and Sustainable Management of the Okavango River Basin (EPSMO) |
| OKACOM: The Permanent Okavango River Basin Water Commission |
| Older people |
| WHO MiNDbank. Older Persons General Policies, Laws, Strategies & Plans and service standards |
| Open access publishing |
| Open Data for Africa African Development Bank Group. |
| openAFRICA "openAFRICA aims to be the largest independent repository of open data on the African continent. openAFRICA is not a government portal. Instead, it’s a grassroots initiative, maintained by Code for Africa, as a public service. The platform is available as a free resource for ordinary citizens, civil society organisations, civic activists, the media, and government agencies." |
| Open data See also: Electronic information |
| Open data see also: Government information and individual countries |
| Open data See also: Open access publishing |
| Open government data |
| Ghana Open Data Initiative |
| Kenya Data Portal |
| OECD OPen Government Data |
| Open government See also: Government information |
| Open government See:Transparency in government |
| Open science See:Communication in science |
| Orange-Senqu River Basin |
| Development and Adoption of a Strategic Action Program for Balancing Water Uses and Sustainable Natural Resource Management in the Orange-Senqu River Transboundary Basin |
| Orange-Senqu River Awareness Kit |
| Orange-Senqu River Commission (ORASECOM). Official site. |
| Orange-Senqu River Commission (ORASECOM). Established by an Agreement entered into on 3 November 2000 by the Governments of the Kingdom of Lesotho, the Republic of Botswana, Republic of South Africa and the Republic of Namibia to establish the Orange-Senqu River Commission, known as ORASECOM for the integrated water resource management of the Orange-Senqu River Basin. Secretariat in South Africa. |
| Project progress review : promotion of river basin organisations : organisation development support to the Limpopo and Orange-Senqu River Basin Commissions. |
| Outer space |
| United Nations Office for Outer Space Affairs (UNOOSA). Includes treaties, agreements and some national laws. |
| Ozone layer depletion - Prevention |
| Multilateral Fund for the Implementation of the Montreal Protocol |
| United Nations Environment Programme. Ozone Secretariat |
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