"This year none of the Western media are allowed to participate in the fair," said Mohammad Ali Ramin, who is also a press watchdog official.
"We have eliminated them, because Western media are dishonest, cocky cheats and see themselves as the invincible sultans of the world," he said, adding that "there are rare exceptions" without elaborating.
Iranian authorities have cracked down on media and journalists since the June 2009 re-election of President Mahmoud Ahmadinejad, which the opposition dismissed as massively rigged, sparking street protests.
Scores of journalists have been jailed and several leading newspapers close to the opposition shut down, while journalists working for foreign media are banned from covering opposition protests.