The impoverished Caribbean nation, notorious for chronic political instability, is also holding second-round legislative elections and is voting for local officials.
The polls are held in a climate of uncertainty, with many afraid of a repeat of the violence that plagued the first-round legislative elections in August when two people were killed.
Despite Haiti's propensity for election violence, -- police will deploy 10,000 officers, backed by 5,000 from the UN peacekeeping force MINUSTAH -- many people were in a buoyant mood in the run-up to the election.
This first-round presidential vote is the only one of several recent elections in Haiti -- the poorest country in the Americas -- to take place on schedule.
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It comes nearly five years after President Michel Martelly came to power at the helm of a country that has failed to find democratic stability since the end of the 30-year Duvalier dictatorship in 1986.
The pop singer and political novice assumed office in 2011, the year after a catastrophic earthquake killed more than 200,000 and left upwards of 1.5 million living on the streets.
One of the few candidates to emerge from the crowded presidential field is Jude Celestin, of the LAPEH party, who was eliminated from the second round in the controversial 2010 vote following a recount by the Organization of American States and is considered the frontrunner this time.
"This time they will not steal the election," supporter Lucksenson Morel said at a noisy rally.
But there is also a groundswell of support in some areas for Maryse Narcisse, a physician and longtime activist of the Fanmi Lavalas party.