Iran and the UN Security Council (UNSC) veto powers plus Germany will resume nuclear talks in Vienna on Tuesday, the Austrian press agency said Monday.
The three-day talks will include EU foreign police chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif.
US Secretary of State John Kerry is expected to join the talks on Wednesday, it said.
The two sides seek a permanent agreement by November 24, a deal that will gaurantee Iran's nuclear program is for peaceful purposes in exchange of easing of Western sanctions against the Islamic Republic.
The nuclear talks are aimed at giving the West guarantees about the peaceful nature of the program.
The West has long suspected Iran of developing nuclear weapons. Tehran denies this and insists its programme is exclusively for peaceful purposes.