Voter turnout on Sunday was high at around 87 percent, according to state broadcast reports, as the divisive election gave transformative new powers for the winner.
Recep Tayyip Erdogan’s ruling AK Party faced challenges from Muharram Ince’s main opposition Republican People’s Party (CHP).
Up to half a million election monitors were deployed to polling stations by opposition parties and NGOs concerned about fraud allegations in the vote.
But predictably, state media announced Mr Erdogan as the winner earlier on – saying he had won 53 percent of 99 votes cast, beating nearest rival Mr Ince on 31 percent.
Who won the Turkey election? How long will Erdogan be president?
Mr Erdogan was declared Turkey’s president by electoral board chairman Sadi Guven, who said he won a majority based on 99.9 percent of counted votes.
The president told crowds in Ankara in the early hours of Monday morning: “This election’s victor is democracy, this election’s victory is national will.”
His win secured him another five-year term in power.
But under a new constitution, Mr Erdogan could seek office again after 2023 and, if successful, could stay as Turkey’s undisputed leader until 2028.
The country has been ruled under emergency powers since a coup attempt in 2016 in which around 160,000 people were detained, according to the United Nations.
How long has Erdogan been in power?
Recep Erdogan has been the country’s de facto leader since 2002, holding the position of president since 2014.
He has been the country’s most popular yet controversial leader in modern-day history.
His latest presidential win sees him assume new executive powers.
Under these, he has the authority to appoint senior public officials, including judges, and rule without a prime minister.
Critics have condemned his previous authoritative measures including a crackdown on protests in 2013, which left 22 people dead.
He survived a coup in 2016 but consequently detained tens of thousands of political opponents.
Several media outlets have either been shut down or taken over.
Mr Erdogan has pledged a crackdown on terrorism and remains popular after years of strong economic growth in the country.
In his victory speech, he said: “The winner of this election is each and every individual among my 81 million citizens.”
He has also vowed to continue to “liberate Syrian lands” so refugees can return to the country safely.