With almost 95% of ballots counted, New Democracy had won 40.5% of the vote, a result that would give Mitsotakis an outright majority with 158 seats in the 300-seat parliament.
Syriza, the centre-left party led by Mitsotakis's main opponent, Alexis Tsipras, was on 17.81%, a routing that was even worse than the 20% it achieved in elections last month.
Several smaller parties, including the previously unheard of Spartans, also crossed the 3% threshold to get into parliament. MeRa 25, led by the maverick former finance minister Yanis Varoufakis, failed to make it into the house.
"The non-entry of MeRa 25 into parliament is the least of it," Varoufakis told reporters. What the left should be mourning, he said, was its failure to turn a 10-year battle of resistance against austerity "into a progressive front [that could] prevent the transformation of rage into a farright current".
A poll on 21 May also ended in a decisive victory for 55-year-old Mitsotakis, but because it was conducted under an electoral system of proportional representation he was left five seats short of a majority. The pro-business leader called a second election with the aim of forming a government that would allow him to push ahead with reforms.
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