There is only one candidate, Abed Rabbo Mansour Hadi.
He was the deputy of Ali Abdullah Saleh, who had ruled the country for 33 years.
The election is part of a U.S. backed deal brokered by Yemen's Gulf Arab neighbors following popular protests demanding Saleh's ouster.
One of the poorest Arab countries, Yemen has become a target of Al-Qaeda, especially in the south, where activists say they will boycott the poll.
Southern activists accuse the north of taking their resources and discriminating against them.
On the eve of the vote, gunmen attacked three polling stations in the south.
Officials say a total of four people were reported killed in clashes across the country.
compiled from agency reports