An incantation, a spell, a charm, an enchantment, or a bewitchery, is a magical formula intended to trigger a magical effect on a person or objects. The formula can be spoken, sung, or chanted. An incantation can also be performed during ceremonial rituals or prayers. In the world of magic, wizards, witches, and fairies are common performers of incantations in culture and folklore.

In ceremonial magic, a magical formula or a word of power is a word that is believed to have specific supernatural effects. They are words whose meaning illustrates principles and degrees of understanding that are often difficult to relay using other forms of speech or writing. It is a concise means to communicate very abstract information through the medium of a word or phrase.