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Welcome to Oxford Public International Law

Oxford Public International Law (OPIL) is a comprehensive, single location providing integrated access across our international law services, bringing you one step closer to the perfect research solution.

Our ground-breaking online resources work to speed up research and provide easy access to authoritative content, essential for anyone working in international law.


With the U.S. Midterms coming up on the 6th of November, we’ve put together a collection of articles from the Max Planck Encyclopedia of Public International Law to help you understand some of the key terms, along with the international background and impact of the issues being discussed.

Start browsing our collection today >>

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Site News

November 9, 2018

New OHT Editorial: The End of the First World War on the Western Front

On the centenary of the 11 November 1918 armistice, Randall Lesaffer looks at the end of the First World War in the latest monthly editorial.

October 19, 2018

New OHT Editorial: The Wars of Louis XIV in Treaties (Part V): The Peace of Nijmegen (1678–1679)

Randall Lesaffer discusses the peace of Nijmegen in the latest of The Wars of Louis XIV in Treaties.

September 14, 2018

New OHT Editorial: The Wars of Louis XIV in Treaties (Part IV): The Second Peace of Westminster (19 February 1674)

Randall Lesaffer looks at the second peace of Westminster in the latest of The Wars of Louis XIV in Treaties.

August 30, 2018

The IMLI Treatise on Global Ocean Governance: now on OSAIL

Volumes I, II, and III of The IMLI Treatise on Global Ocean Governance are now available to read on OSAIL.