Greek conservative leader Kyriakos Mitsotakis has trounced his centre-left rival in the second election in a month and said he has a “strong mandate” to move faster on the path of change.
His New Democracy party (ND) won 40.5% of the national vote, almost 23 points ahead of Alexis Tsipras’s Syriza party.
He beat Syriza in May, but called new elections in a bid to win a majority.
“ND is today the most powerful centre-right party in Europe,” he told delighted supporters in Athens.
Mr Mitsotakis is credited with successfully returning the Greek economy to stability and growth after a severe debt crisis and three international bailouts.
Although many Greeks are struggling with the cost-of-living crisis, voters chose to stick with the party promising lower taxes and improved public health.
The vote came 11 days after a migrant boat tragedy off Greece in which about 500 people are thought to have died.
Three days of mourning were held, however the disaster had little effect on the campaign and Greeks voted to maintain economic stability.
“The people have given us a safe majority,” said Mr Mitsotakis as the extent of his victory became clear. “Major reforms will go ahead quickly.”
Last month, his party fell just short of a majority in the 300-seat parliament and his decision to call an election in a bid to form a stable, single-party government was vindicated by Sunday’s result.
Under Greek rules for a second election, the biggest party is awarded a bonus of between 20 and 50 seats. With more than 40% of the vote, New Democracy won all 50.
Mr Mitsotakis said he could not promise miracles, but that New Democracy had “high goals” to transform Greece with a better public health service and education.
Former Prime Minister Alexis Tsipras’s centre-left Syriza had been soundly defeated in the first election and lost further ground in the second, with less than 18% of the vote. He dampened speculation that he would resign, saying that was a decision for his party members.