Voters are heading to the polls across the country to decide whether the UK’s future will be within or outside the European Union.
The Electoral Commission says a record 46,499,537 people are eligible to vote, with turnout expected to be very high.
Polling stations opened at 07:00 BST and will close at 22:00 BST.
The ballot paper asks a single question:
“Should the United Kingdom remain a member of the European Union or leave the European Union?”
Voters can find the location of their local polling station on their polling card or by searching with their postcode on the Electoral Commission’s About My Vote website.
Newspapers and broadcasters are limited in what they can report while the polls are open, but once they close at 22:00 the results will be reported as they come in.
When the polls have closed, the sealed ballot boxes will be collected and transported to the count venue for each of the 382 local counting areas, which represent the 380 local government areas in England, Scotland, and Wales, as well as Northern Ireland and Gibraltar.