In some religions an exorcist (also called a witchman) is a person who is believed to be able to cast out the devil or other demon. A priest, a monk, a healer, a shaman or other specially prepared or instructed person can be an exorcist. An exorcist is a person who performs the ridding of demons or other supernatural beings who are alleged to have possessed a person, or (sometimes) a building or even an object.

Since the Council of Trent, "Exorcist" was one of the four minor orders in the ministry Roman Catholic Church, received after the tonsure. At the time this order was formally defined and confined exclusively to exorcism of the catechumen in the rite of Baptism, leaving exorcisms of demons to priests; but its role was later expanded. By the twentieth century, the order had become purely ceremonial.

As a minor order, Exorcists wore the surplice. The office of Exorcist was not a part of the sacrament of Holy Orders but as a sacramental was instead first conferred on those who had the special charism to perform its duties and later to those studying for the priesthood. The Exorcist order was suppressed during the reforms of the minor orders after the Second Vatican Council by Paul VI.

It remains in societies which use the extraordinary form of the Latin Rite (also called "Ecclesia Dei communities"), such as the Priestly Fraternity of St. Peter. Some believe that attainment of the position of Acolyte in post-Council practices implies ordination to the minor orders which used to be below it, such as Exorcist and Porter, although this has not been officially defined (although Canon Law section 1009 does specifically state that the only "orders are the episcopate, the priesthood and the diaconate").

The Catechism of the Catholic church states that: "Jesus performed exorcisms and from him the Church has received the power and office of exorcizing". Recently, many dioceses have formally appointed priests to the function of Exorcist as a result of reaffirmation of exorcism as a necessary ritual by Pope John Paul II (who reportedly performed three exorcisms himself during his pontificate) and Pope Benedict XVI. Gabriele Amorth is the chief exorcist of the Diocese of Rome, and founder of the International Association of Exorcists.

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