The country's top nuclear negotiator, Saeed Jalili, said he has formally called on the United States, Russia, China, Britain, France and Germany to return to negotiations.
The invitation comes after new sanctions recently imposed by the West over Tehran's enrichment of uranium.
"We formally declared to them [the intent] to return to the path of dialogue for co-operation," Jalili told Iranian diplomats in Tehran, according to the official IRNA news agency. Jalili did not say when or through what channel he issued the invitation.
Iran's ambassador to Germany, Ali Reza Sheikh Attar, said earlier Saturday that Jalili was to send a letter soon to the European Union's foreign policy chief Catherine Ashton to arrange a new round of talks.
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