The Permanent Representative of the United Kingdom to the European Union was the United Kingdom's foremost diplomatic representative to the European Union, and head of the United Kingdom Representation to the European Union (UKREP), while the United Kingdom was a member state of the European Union. Their official title was Her Britannic Majesty's Permanent Representative to the European Union. Since the UK left the EU on 31 January 2020, the role was replaced with the British Ambassador to the European Union.