Iran’s chief negotiator Ali Baqeri Kani said that his government had agreed to meet in Vienna on 29 November.
The discussions have been on hold since the election of Iran’s new hard-line president in June.
The US pulled out of the deal under President Donald Trump, but Washington has since said it could consider rejoining.
The Biden administration said it will attend the Vienna meet, along with the remaining signatories, the UK, China, France, Germany and Russia.
Writing on Twitter on Wednesday, Mr Kani said Iran had “agreed to start the negotiations aiming at removal of unlawful and inhumane sanctions on 29 November in Vienna”.
Under the 2015 agreement, Iran agreed to restrictions on its enrichment of uranium, which has civilian uses but can also be used in nuclear weapons; the amount of that material it could stockpile; and also the type of machinery (centrifuges) used to perform the enriching.
