Reformist candidates allied with Iranian President Hassan Rowhani emerged victorious on Saturday in parliamentary run-off elections, multiple Iranian media outlets reported.
A coalition of reformists and conservatives received 60 per cent of Friday's vote, repeating the success they saw during the first round of voting in February.
Independent candidates received 10 per cent, while hardline candidates received 30 per cent.
Sixty-eight of the 290 seats in parliament were up for grabs in the elections.
Four female candidates were elected in the second round, adding to the 14 women who were elected in February.
The reformists' coalition with conservatives - who had previously sided with hardline candidates - have swayed the balance of the vote in earlier elections.
Some 17 million Iranians were registered to take part in the vote, which posted a turnout of 59 per cent.
Parliament's next legislative period is due to start on May 28.
With the new balance of power in parliament, observers expect a victory for Rowhani in presidential elections scheduled for May 2017.
With hardliner elites voted out in the parliamentary elections, former hardliner president Mahmoud Ahmadinejad has been brought forth as a possible candidate to run against Rowhani.
"We'll see each other - God willing - in 2017," he told followers during a meeting at the beginning of the month, according to news website Alef.