The United Kingdom European Union Membership Referendum, also known as the EU referendum or Brexit referendum (because of the potential exit of Britain from the EU), is a plebiscite scheduled to take place in the United Kingdom and Gibraltar on June 23, 2016. Membership in the European Union has been a topic of debate in the United Kingdom since before the country joined the European Economic Community (EEC or "Common Market"), as it was known then, in 1973.

To help inform a broader cross-section of the public and provide them with authoritative analysis on questions that relate to the highly contentious possibility of a Brexit, Oxford University Press has now made freely available a large selection of materials from the Oxford Public International Law database relating to the Brexit debate. To keep track of recent commentary on and information about the legal consequences of a Brexit, they have also made available a new Brexit Debate Map.

Readers can also keep themselves informed by consulting theBBC's All You Need to Know page on the Brexit referendum debate.