Danes are voting in an election with Prime Minister Mette Frederiksen's Social Democrats aiming for a third term.
Frederiksen, 48, called the vote months earlier than expected, buoyed by popular support for her handling of US President Donald Trump's threat to annex Greenland, an autonomous Danish territory.
Her Social Democrats have lost support since the 2022 elections and she is facing a strong challenge from two parties on the centre-right, including the Liberal Venstre party of Defence Minister Troels Lund Poulsen.
Denmark is run by coalition governments and Tuesday's vote will decide whether power will stay with a left-win bloc or move to the right.
Latest opinion polls give Frederiksen's Social Democrats by the far the largest share of the vote, on more than 20%, well ahead of the Liberals and Green Left.
