Ankara: The Turkish electoral authority declared Erdogan the winner of the election which will see him secure another five-year term.
"Based on provisional results, it has been determined that Recep Tayyip Erdogan has been elected president," Supreme Election Council chairman Ahmet Yener was quoted as saying by the Anadolu state news agency.
Leaders of Russia, Hungary, Pakistan congratulate Erdogan
Russian President Vladimir Putin congratulated Turkish leader Recep Tayyip Erdogan, saying his victory was "the logical result" of his dedicated work as head of the Turkish Republic. Putin also praised Erdogan for his "personal contribution to the strengthening of friendly Russian-Turkish relations."
Pakistan's Prime Minister Shehbaz Sharif described the long-reigning Turkish leader as a "pillar of strength for the oppressed Muslims" as well as an "ardent voice for their inalienable rights." Qatar and Iran also offered their congratulations.
Separately, Hungary's Viktor Orban praised Erdogan's "unquestionable election victory" on Twitter.
Kilicdaroglu says election was 'the most unfair' in years
Opposition leader Kemal Kilicdaroglu pledged to continue "leading this struggle" against the Erdogan regime.
"My real sadness is about the difficulties awaiting the country," he said, without explicitly conceding defeat.
He also decried "the most unfair election in years" after projections showed him losing to the nationalist president.
Erdogan says the 'only winner' is Turkey
The Turkish president spoke to supporters shortly after declaring victory, saying voters had given him the responsibility of governing for the next five years.
"The only winner today is Turkey," Recep Tayyip Erdogan said.