A pentacle (or pantacle in Thelema) is an amulet used in magical evocation, generally made of parchment, paper or metal (although it can be of other materials), on which the symbol of a spirit or energy being evoked is drawn. It is often worn around the neck, or placed within the triangle of evocation. Protective symbols may also be included (sometimes on the reverse), a common one being the five-point form of the Seal of Solomon, called a pentacle of Solomon or pentangle of Solomon. Many varieties of pentacle can be found in the grimoires of Solomonic magic; they are also used in some neopagan magical traditions, such as Wicca, alongside other magical tools.

The words pentacle and pentagram (a five-point unicursal star) are essentially synonymous, according to the Online Oxford English Dictionary (2007 revision), tracing the etymology through both French and Italian back to Latin, but notes that in Middle French the word "pentacle" was used to refer to any talisman. In an extended use, many magical authors treat them as distinct. In many tarot decks and in some forms of modern witchcraft, pentacles often prominently incorporate a pentagram in their design.