Stone hosted a workshop for filmmakers during the Fajr Film Festival and planned to hold a news conference on Wednesday, Iranian media reported. French actor Jean-Pierre Léaud and Italian producer Giovanni Spagnoletti are also attending the festival.
The semi-official Tasnim news agency said Stone briefly visited the historical city of Isfahan the previous day.
This is the Hollywood director's first visit to Iran.
In 2007, Iran's then-President Mahmoud Ahmadinejad rejected a proposal by Stone to make a film about him. Ahmadinejad said at the time that Stone is part the "Great Satan" cultural establishment, a reference to the United States.
In 2012, Stone's son Sean Stone visited Iran and converted to Shiite Islam.
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