The negotiations on Monday are led by the Iranian FM Mohammad Javad Zarif and US Secretary of State John Kerry in Geneva.
The meetings are attended by Iran’s deputy foreign ministers, Abbas Araqchi and Majid Takht-e Ravanchi, as well as US Under Secretary of State for Political Affairs Wendy Sherman and European Union's Deputy Foreign Policy Chief Helga Schmid.
The previous round of talks between the two sides ended earlier the day after 3 hours of discussions. They held talks for 2.5 hours on Sunday.
No details on the meetings have surfaced for the time being.
The 34d round of egotiations between the Iranian and US teams on Monday will be the final round of talks this week.