Eligible people will cast their votes in 3,100 ballot boxes of 10 constituencies across the country.
Nearly 100 thousand people are active to ensure a smooth election.
Necessary health protocols are in place at the ballot boxes due to coronavirus outbreak.
The main parliamentary elections were held on February 21, 2020, but the number of the lawmakers was not complete due to the death of some of the elected candidates or failing to attain the legal number of votes.
In March, the Guardian Council agreed to postpone the runoff elections because of the COVID19 spread.