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Overjoyed supporters climbed onto tables and cheered as newly-elected Austrian president Alexander Van der Bellen arrived at a victory party.
The left-leaning independent candidate and former Greens leader was put several points ahead of his far-right rival Norbert Hofer in the election re-run, following a narrow win in May.
"Thank god for this result," said Iraqi refugee Mahmoud, as Van der Bellen entered the room at a fashionable Vienna hotel to the strains of Queen's 'We are the Champions'.
A message from Van der Bellen was displayed on a giant screen, reading: "Thanks for walking this very, very, very long path with us."
Austria's far-right presidential candidate has conceded defeat and urged the country to "work together".
In a Facebook message, Mr Hofer, who ran for the anti-immigration Freedom Party, thanked his supporters and congratulated his rival, urging people to "pull together and work together".
"We are all Austrians, no matter how we decided at the ballot box," he added.
He had hoped to become Europe's first free-elected far-right head of state since the Second World War.
Hofer's campaign manager Herbert Kickl had already conceded defeat as predictions when polls closed put independent Alexander Van der Bellen ahead - slamming "the establishment".
A left-leaning environmentalist candidate has a "clear lead" in Austria's presidential election, according to projections.
In a blow to his rival's bid to become Europe's first freely-elected far-right head of state since the Second World War, independent candidate Alexander Van der Bellen was ahead by several points in the SORA projection when polls closed.
If confirmed, the result will come as vindication for former Greens leader Van der Bellen, who only narrowly defeated the anti-immigration Freedom Party candidate Norbert Hofer in the original run in May before a re-run was ordered.
Poll company SORA, for broadcaster ORF, put Van der Bellen on 53.6 per cent and Hofer on 46.4 per cent, with a 1.2 per cent error of margin.
Another pollster, Arge, for news agency APA, reported similar predictions.
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Austria is set vote for its new president again - and possibly elect the first far-right head of state in Europe since World War Two.
Austrians go to the polls on Sunday where voters could elect the European Union's first far-right head of state.