Aftermath of the United Kingdom European Union membership referendum, 2016

After the UK EU membership referendum held on 23 June 2016, in which a majority voted to leave the European Union, the United Kingdom experienced political and economic upsets, with spillover effects across the rest of the European Union and the wider world. Prime Minister David Cameron, who had campaigned for Remain, announced his resignation on 24 June, triggering a Conservative leadership election, won by Home Secretary Theresa May. Following Leader of the Opposition Jeremy Corbyn's loss of a vote of no confidence among the Parliamentary Labour Party, he also faced a leadership challenge, which he won. Nigel Farage stepped down from leadership of the pro-Leave party UKIP in July but then became the party's interim leader on 5 October after its elected party leader resigned.

Political disagreement remains about several factors: the timescale for Britain's withdrawal; what terms it will negotiate; and whether Article 50 of the Treaty of the European Union, which governs withdrawal from the European Union, must be triggered and who can trigger it. Some politicians, including Conservative Jacob Rees-Mogg and Liberal Democrat Nick Clegg, have suggested that a general election should be held before withdrawal is confirmed, although this would be likely to require repeal of the Fixed-term Parliaments Act 2011.

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