Vucic was re-elected after winning 59.9% of the vote.
According to unofficial results announced by pollsters Ipsos and Cesid, Vucic secured more than the necessary 50% needed for victory in the first round, while second-placed Zdravko Ponos won 17.8%.
Meanwhile, in parliamentary elections, Vucic's Together We Can Do Everything coalition is leading with 43.6% of the vote based on 68.4% of the counted votes.
Marinika Tepic's United for Serbia's Victory coalition is in second place with 12.8%, while Ivica Dacic's Socialist Party of Serbia is in third place with 11.6%.
Vucic told reporters at the election headquarters of his Serbian Progressive Party (SNS) that he won 2.245 million votes out of the 3.84 million people who took part in Sunday's polls.
"I am proud of the fact that I managed to do something that no one has ever succeeded in doing in Serbia," said Vucic, adding that former presidents Tomislav Nikolic and Boris Tadic garnered around 950,000 and 850,000 votes respectively in the first round of the presidential elections.
Besides the general elections, local elections were also held in 12 municipalities and two cities, including Belgrade.
Meanwhile, eight candidates competed in the presidential election.
Presidential candidates are required to win more than 50% of the vote for a runoff not to be needed.
Vucic won the previous election with 55.08% of the vote in the first round.
Presidential terms in Serbia are five years.
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