The two-day nuclear talks would begin Wednesday, Press TV quoted Iranian Foreign Ministry official Hamid Baeidinejad as saying.
The meeting will work on the details of a possible comprehensive deal on Tehran's nuclear program ahead of a high-level nuclear meeting slated for June 16 in Vienna.
Iran and the P5+1 group are working out a comprehensive deal following the interim accord reached in Geneva Nov 24, 2013 athat came into effect on Jan 20.
The interim agreement, titled the Joint Plan of Action, includes a short-term freeze of portions of Iran's nuclear programme in exchange for decreased economic sanctions as the countries work towards a long-term agreement.
This is the first formal agreement between the US and Iran in 34 years.
Iran and the six powers have held several rounds of nuclear talks this year. The latest ended in Vienna on May 16 without reaching any deal.