Mohammed Madad was collected by police from his home in the northeast town of Noventa Vicentina and put on a flight for Morocco from Rome's main airport late Tuesday.
Madad, a 52-year-old father of four, was banned from re-entering Italy for the next 15 years.
The firebrand cleric's sermons became increasingly violent and anti-Western with the aim of indoctrinating youngsters with radical Salafite ideology, according to anti-terrorism investigators.
Madad was capable of international terrorism, the investigators said.
A probe was opened into Madad after police received several tip-offs from the public, investigators said.
Earlier this year, Madad was appointed imam of a mosque and Islamic centre in Noventa Vicentina, which has a sizeable Muslim community.
Close to 100 terrorism suspects have been expelled from Italy since the beginning of 2015.
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