Polling stations opened at 8:00 am local time (0330 UTC) in a highly-contested run-off to February`s elections.
"The voters will elect 68 lawmakers in constituencies that candidates failed to get 25 percent of votes cast in the first round of the election," said Iranian Interior Minister Abdolreza Rahmani Fazli, reported Reuters news agency citing state TV.
The vote comes after President Hassan Rouhani`s allies won strong public backing in the first round of voting in late February. Reformists, including moderates and centrists, swept all 30 seats in the capital Tehran for a total of 95 across the country, while independents performed well, garnering roughly 20 percent of the contested seats.
However, the pro-Rouhani List of Hope and the conservatives, which gained 103 seats, failed to secure a majority.
Friday`s vote is crucial to bolstering Rouhani`s reformist policies, which witnessed a landmark deal with world powers in 2015, ending years of international sanctions in exchange for Iran curbing its nuclear program.
The results of Friday`s run-off are expected to be announced on Sunday, according to the interior minister. The new parliament is scheduled to begin its first session on May 27.
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