L'indépendence de l'Ecosse
Voters will answer "Yes" or "No" to the referendum question: "Should Scotland be an independent country?"
With 4,285,323 people - 97% of the electorate - registered to vote, a historically high turnout is expected.
Votes will be cast at 2,608 polling places across the country until 22:00 on Thursday.
The result is expected early on Friday morning.