The talks will take place from May 5 to 9 on the sidelines of a Nuclear Non-Proliferation Treaty (NPT) review conference that is to be held at the United Nations, deputy foreign minister Abbas Araqchi told the state broadcaster IRIB.
He said the Iranian delegation will be led by Hamid Baeedinejad, like previous rounds, without providing further details.
The meeting will come a few days before a new round of talks between Iran and the so-called P5+1 group of world powers, set to begin May 13, that seeks a comprehensive agreement over Tehran's disputed nuclear activities.
They will now move to draft the final accord, after clinching an interim deal in November under which Iran froze some nuclear activities in return for minor relief from painful Western sanctions.
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A lasting deal may involve Iran slashing its number of centrifuges - used to enrich uranium - changing the design of a new reactor at Arak and giving UN inspectors more oversight.
Western nations and Israel have long suspected Iran of secretly pursuing nuclear weapons alongside its civilian programme, charges adamantly denied by Tehran.