Iranians are voting in elections for their country’s parliament and the Assembly of Experts, a clerical body that appoints the supreme leader, the BBC reports.
The poll is the first since Iran and world powers agreed a landmark deal over Iran’s nuclear programme.
Reformists and moderates who back President Hassan Rouhani have formed a coalition called The List of Hope that aims to reduce the number of hardliners in the two bodies.
Almost 55m people are eligible to vote.
The parliamentary elections are to elect 290 MPs for four-year terms. Voters will also select 88 clerics to the Assembly of Experts, who serve eight-year terms.
Voting started at 08:00 local time (04:30 GMT) and closes at 18:00. But officials say polling stations could stay open longer if there are queues and more time is needed.
Eight Armenians are running for two seats in the Iranian Parliament.
