Tehran Mayor Mohammad Bagher Qalibaf has urged his supporters to back Ebrahim Raisi, who is believed to be a favourite of Supreme Leader Ayatollah Ali Khamenei.
Liberal politician Moon Jae-in's victory would end nearly a decade of conservative rule and bring a more conciliatory approach toward North Korea.
Opinion polls released in the wake of the results of the first vote see political novice 39-year-old Emmanuel Macron ahead of the National Front's Marine Le Pen.
Conservative Prime Minister Aleksandar Vucic is the runaway favourite to win Serbia's presidential elections while the opposition has been unable to field a united candidate to run against him.
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