Assad took part in prayers at the al-Noori mosque located north of Damascus.
State television showed Assad being greeted by Syrian Grand Mufti Ahmed Badreddin Hassoun and scores of well-wishers.
During the holy month, adult Muslims are required to fast from sunrise to sundown as an effective way of practicing self-discipline. They are also expected to avoid sinning and to strengthen their souls through praying, charitable deeds, and introspection.
Muslim people mark the Eid al-Fitr festival at the end of Ramadan.
