The capital Tehran and other cities and towns are witnessing rallies in celebration of the victory that put an end to the monarchical rule of the US-backed Pahlavi regime.
Iranian President Hassan Rouhani is scheduled to deliver a speech on the occasion.
By attending the rallies on Wednesday, the Iranians reaffirm their allegiance to the causes of the Islamic Revolution and Ayatollah Ruhollah Khomeini, the late founder of the Islamic Republic.
On the 22nd day of the month of Bahman on the solar calendar year of 1357, Iranians put an end to 2,500 years of monarchical rule in the country.
The Islamic Revolution, under the leadership of Imam Khomeini, established a new political system based on Islamic values and democracy.
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