The Department for Exiting the European Union (DExEU; also known as the Department for Brexit or Brexit Department) was the government department of the United Kingdom responsible for overseeing negotiations relating to Brexit, and establishing the future relationship between the United Kingdom and the EU. It was formed by the Prime Minister, Theresa May, in July 2016, in the wake of the referendum vote to leave the European Union. The department was dissolved on 31 January 2020 when Brexit took effect.