International law index O in the United States
- Objective Regime
- Observers
- Occupation, Belligerent
- Occupation, Military, Termination of
- Occupation, Pacific
- Oder-Neisse Line
- Oil Concession Disputes, Arbitration on
- Oil for Food Programme
- Oil Platforms Case (Iran v United States of America)
- Okavango River
- Ombudsperson
- Opinion 1/94
- Opinion and Expression, Freedom of, International Protection
- Option of Nationality
- Optional Provision
- Orange River
- Ordre public (Public Policy)
- Organization for Economic Co-operation and Development (OECD)
- Organization for Economic Co-operation and Development, International Energy Agency (IEA)
- Organization for Economic Co-operation and Development, Nuclear Energy Agency
- Organization for Security and Co-operation in Europe (OSCE)
- Organization for Security and Co-operation in Europe, Court of Conciliation and Arbitration
- Organization of American States (OAS)
- Organization of Arab Petroleum Exporting Countries (OAPEC)
- Organization of Eastern Caribbean States (OECS)
- Organization of the Islamic Conference (OIC)
- Organization of the Petroleum Exporting Countries (OPEC)
- Organizations and Courts
- Organizations of a Universal Character (1975)
- Orinoco River
- Oscar Chinn Case
- Ottoman Debt Arbitration
- Outer Space
- Outer Space, Liability for Damage
- Overflight
- Overseas Territories, Australia, France, Netherlands, New Zealand, United Kingdom, United
- Ozone Layer, International Protection
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