Around 30 million voters are going to the polls in the General Election called by Theresa May just over seven weeks ago.
Polling stations all over the UK are open from 7am until 10pm on Thursday, with the results being declared overnight and throughout Friday.
Polling day follows a frantic dash for votes in the final 24 hours of campaigning by the Prime Minister, Labour leader Jeremy Corbyn and the Liberal Democrat leader Tim Farron.
Most polling stations are in schools, community centres and parish halls, but pubs, a launderette and a school bus have been used in the past.
A handful of seats are expected to be declared by midnight, with the final results expected on Friday afternoon.
Unusually, no local elections are taking place at the same time, so results might come through earlier than in recent general elections.
At the last General Election in 2015, David Cameron won a majority of 12 for the Conservatives after five years leading a Coalition government with the Liberal Democrats. Turnout in 2015 was 66.2%.
The Conservatives won 37.7% of the votes and 330 seats, Labour 31.2% and 232 seats, UKIP 12.9% and one seat and the Liberal Democrats 8.1% and eight seats.
But Mr Cameron then quit as Prime Minister immediately after the UK voted to leave the European Union in a referendum on 23 June last year and he was succeeded by Mrs May last July.
compiled by the Hubwell News Team