in Islām, the birthday of a holy figure, especially the birthday of the Prophet Muḥammad (Mawlid an-Nabī).

Muḥammad's birthday, arbitrarily fixed by tradition as the 12th day of the month of Rabīʿ I, i.e., the day of Muḥammad's death, was not celebrated by the masses of Muslim faithful until about the 13th century. At the end of the 11th century in Egypt, the ruling Shīʿite Fāṭimids (Fāṭimid Dynasty) (descendants of ʿAlī, the fourth caliph, through his wife Fāṭimah, Muḥammad's daughter) observed four mawlids, those of Muḥammad, ʿAlī, Fāṭimah, and the ruling caliph. The festivals, however, were simple processions of court officials, held in daylight hours, that culminated in the recitation of three sermons (khutbahs) in the presence of the caliph.

Sunnites (Sunnite), who constitute the major branch of Islām, regard a mawlid celebration held in 1207 as the first mawlid festival. That occasion was organized by Muẓaffar ad-Dīn Gökburi, brother-in-law of the Egyptian sultan Saladin, at Irbīl, near Mosul (Iraq). It closely parallels the modern mawlid in form. The actual day of Muḥammad's birth was preceded by an entire month of merrymaking. Musicians, jugglers, and assorted entertainers attracted people from as far away as Baghdad and Niṣībīn (mod ern Nusaybin, Turkey); and Muslim scholars, jurists, mystics, and poets began arriving as much as two months in advance. Two days before the formal mawlid a large number of camels, sheep, and oxen were sacrificed, and on the eve of mawlid a torchlight procession passed through the town. On the morning of the mawlid, the faithful and the soldiery assembled in front of a specially erected pulpit to hear the sermon. The religious dignitaries were then honoured with special robes, and all those attending were invited to feast at the prince's expense.

The mawlid festival quickly spread throughout the Muslim world, partly because of a contemporary corresponding enthusiasm for Ṣūfism (Islāmic mysticism), which allowed Islām to become a personal experience. Even in Arabia, where the Prophet's birthplace and tomb had been simply the sites of pious but not required pilgrimage, the mawlid celebrations took hold. Many Muslim theologians could not accept the new festivities, branding them bidʿahs, innovations possibly leading into sin. The mawlid, indeed, betrayed a Christian influence; Christians in Muslim lands observed Christmas in similar ways, and Muslims often participated in the celebration. Modern fundamentalist Muslims such as the Wahhābīyah (Wahhābī) still view the mawlid festivities as idolatrous.

Mawlids, however, continue to be celebrated and have been extended to popular saints and the founders of Ṣūfī brotherhoods. The mawlid poems, which relate Muḥammad's life and virtues, are also widely popular outside the times of regular feasts. Mawlids are also recited in commemoration of deceased relatives.