Mahmoud Ahmadinejad says the West does not have the right to interfere in Tunisia's internal affairs, Press TV reported.
Addressing crowds of people in the central Iranian city of Yazd on Wednesday, President Ahmadinejad said Western countries aim to deprive the Tunisians of their rights through psychological warfare.
He urged the Tunisian politicians to be vigilant and pay attention to the cause of their people, adding that Tunisians want an Islamic government.
Elsewhere in his speech, the Iranian president slammed the Western-backed UN tribunal investigating the assassination of former Lebanese Prime Minister Rafiq Hariri.
President Ahmadinejad called on the US and its European allies to stop meddling in Lebanon, which he said is at a critical juncture.
The Iranian chief executive also called for promotion of unity among all Lebanese factions.