Jinn (Arabic: جن‎, jinn) – also romanized as djinn or anglicized as genies – are invisible creatures in early pre-Islamic Arabian religious systems and later in Islamic culture and beliefs. Like humans, they are accountable for their deeds, can be either believers (Muslim) or unbelievers (kafir); depending on whether they accept God's guidance. Since jinn are neither innately evil nor innately good, Islam acknowledged spirits from other religions and was able to adapt them during its expansion. Jinn are not a strictly Islamic concept; they may represent several pagan beliefs integrated into Islam. To assert a strict monotheism and the Islamic concept of Tauhid, Islam denies all affinities between the jinn and God, thus placing the jinn parallel to humans, also subject to God's judgment and afterlife. The Quran condemns the pre-Islamic Arabian practise of worshipping the jinn, or seeking protection from them.

Although generally invisible, jinn are supposed to be composed of thin and subtle bodies (ad̲j̲sām), they can change at will. They favour snake form, but can also choose to appear as scorpions, lizards or as humans. They may even engage in sexual affairs with humans and produce offspring. If they are injured by someone, they usually seek revenge or possess the assailant's body, refusing to leave it until forced to do so by exorcism. Jinn do not usually meddle in human affairs, preferring to live with their own kind in tribes similar to those of pre-Islamic Arabia.

Individual jinn appear on charms and talismans. They are called upon for protection or magical aid, often under the leadership of a king. Many people who believe in jinn wear amulets to protect themselves against the assaults of jinn, sent out by sorcerers and witches. A commonly-held belief maintains that jinn cannot hurt someone who wears something with the name of God (Allah) written upon it. While some Muslim scholars in the past have had ambivalent attitudes towards sorcery, believing that good jinn do not require one to commit sin, most contemporary Muslim scholars associate dealing with jinn with idolatry.