Sufism, mystical Islamic belief and practice in which Muslims seek to find the truth of divine love and knowledge through direct personal experience of God. It consists of a variety of mystical paths that are designed to ascertain the nature of humanity and of God and to facilitate the experience of the presence of divine love and wisdom in the world.

Islamic mysticism is called taṣawwuf (literally, “to dress in wool”) in Arabic, but it has been called Sufism in Western languages since the early 19th century. An abstract word, Sufism derives from the Arabic term for a mystic, ṣūfī, which is in turn derived from ṣūf, “wool,” plausibly a reference to the woollen garment of early Islamic ascetics. The Sufis are also generally known as “the poor,” fuqarāʾ, plural of the Arabic faqīr, in Persian darvīsh, whence the English words fakir and dervish.

Though the roots of Islamic mysticism formerly were supposed to have stemmed from various non-Islamic sources in ancient Europe and even India, it now seems established that the movement grew out of early Islamic asceticism that developed as a counterweight to the increasing worldliness of the expanding Muslim community; only later were foreign elements that were compatible with mystical theology and practices adopted and made to conform to Islam.

By educating the masses and deepening the spiritual concerns of the Muslims, Sufism has played an important role in the formation of Muslim society. Opposed to the dry casuistry of the lawyer-divines, the mystics nevertheless scrupulously observed the commands of the divine law. The Sufis have been further responsible for a large-scale missionary activity all over the world, which still continues. Sufis have elaborated the image of the Prophet Muhammad—the founder of Islam—and have thus largely influenced Muslim piety by their Muhammad-mysticism. Sufi vocabulary is important in Persian and other literatures related to it, such as Turkish, Urdu, Sindhi, Pashto, and Punjabi. Through the poetry of these literatures, mystical ideas spread widely among the Muslims. In some countries Sufi leaders were also active politically.