At the mausoleum downtown Tehran, Ayatollah Khamenei uttered prayer and recited Quran to commemorate the late Imam.
Also, the Supreme Leader paid homage to the Islamic Revolution and war-time martyrs and defenders of the holy shrines.
Annually, Ten-Day Fajr (Dawn) which starts on February 1 is celebrated across Iran.
The day remembers the return of the late Imam Khomeini - the Father of the Islamic Revolution and Founder of the Islamic Republic - to Iran after 15 years of exile.
His return led to the victory of the 1979 Islamic Revolution only ten days later. The period has been termed as Ten-Day Fajr (Dawn) in Iran.
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