A Black Mass is a ceremony celebrated by various Satanic groups. It has allegedly existed for centuries in different forms, and the modern form is intentionally a sacrilegious and blasphemous parody of a Catholic Mass.

In the 19th century the Black Mass became popularized in French literature, in books such as Satanism and Witchcraft, by Jules Michelet, and Là-bas, by Joris-Karl Huysmans.

Modern revivals began with H.T.F. Rhodes' book The Satanic Mass published in London in 1954, and there is now a range of modern versions of the Black Mass performed by various groups.

The Catholic Church regards the Mass as its most important ritual, going back to apostolic times. In general, its various liturgies followed the outline of Liturgy of the Word, Offertory, Liturgy of the Eucharist and Benediction, which developed into what is known as the Mass. However, as early Christianity became more established and its influence began to spread, the early Church Fathers began to describe a few heretical groups practicing their own versions of Masses. Some of these rituals were of a sexual nature. The fourth-century AD heresiologist Epiphanius of Salamis, for instance, claims that a libertine Gnostic sect known as the Borborites engaged in a version of the Eucharist in which they would smear their hands with menstrual blood and semen and consume them as the blood and body of Christ respectively. He also alleges that, whenever one of the women in their church was experiencing her period, they would take her menstrual blood and everyone in the church would eat it as part of a sacred ritual. Saint Augustine, also writing in the fourth century, describes a group referred to as "Catharistas" ("purifiers"), who added the mixture of male and female sexual fluids to flour to create a "Sacrament" which they ate, in the belief that they were purifying the substance through eating it.

Within the Church, the rite of the Mass was not completely fixed, and there were places at the end of the Offertory for the Secret prayers, when the priest could insert private prayers for various personal needs. These practices became especially prevalent in France . As these types of personal prayers within the Mass spread, the institution of the Low Mass became quite common, where priests would hire their services out to perform various Masses for the needs of their clients (Votive Masses)—such as blessing crops or cattle, achieving success in some enterprise, obtaining love, or even cursing enemies (one way this latter was done was by inserting the enemy's name in a Mass for the dead, accompanied by burying an image of the enemy). Although these practices were condemned by Church authorities as superstitious and sacrilegious abuses, they still occurred secretively. In the 12th and 13th centuries there was a great surplus of clerics and monks who might be inclined to perform these Masses, as younger sons were often sent off to religious universities, and after their studies, needed to find a livelihood. Also within the Church, the ritual of the Mass was sometimes reworked to create light-hearted parodies of it for certain festivities. Some of these became quasi-tolerated practices at times—though never accepted by official Church authorities—such as a festive parody of the Mass called "The Feast of Asses", in which Balaam's ass (from the Old Testament) would begin talking and saying parts of the Mass. A similar parody was the Feast of Fools. Though often condemned, practitioners of such activities, called "Goliards", continued despite the Church's disapproval.

Another result of the surplus of (sometimes disillusioned) clerical students was the appearance of the Latin writings of the Goliards and wandering clerics (clerici vagantes). There began to appear more cynical and heretical parodies of the Mass, also written in ecclesiastical Latin, known as "drinkers' Masses" and "gamblers' Masses," which lamented the situation of drunk, gambling monks, and instead of calling to "Deus" (God), called to "Bacchus" (the Roman god of wine) and "Decius" (the god of dice, which were used in gambling). Some of the earliest of these Latin parody works are found in the medieval Latin collection of poetry, Carmina Burana, written around 1230. At the time these wandering clerics were spreading their Latin writings and parodies of the Mass, the Cathars, who also spread their teachings through wandering clerics, were also active. Due to the proximity in time and location of the Goliards, the Cathars, and the witches, all of whom were seen as threatening the authority of the Catholic Church and its head, the Papacy in Rome, some historians have postulated that these wandering clerics may have at times offered their services for performing heretical, or "black" Masses on various occasions.

A further source of late Medieval and Early Modern involvement with parodies and alterations of the Mass were the writings of the European witch-hunt, which saw witches as being agents of the Devil, who were described as inverting the Christian Mass and employing the stolen Host for diabolical ends. Witch-hunter's manuals such as the Malleus Maleficarum (1487) and the Compendium Maleficarum (1608) allude to these supposed practices. The first complete depiction of a blasphemy of the Mass in connection with the Witches' Sabbath, was given in Florimond de Raemond's 1597 French work, The Antichrist (written as a Catholic response to the Protestant claim that the Pope was the Antichrist). He uses the following description of a witches' meeting as a sign that Satanic practices are prevalent in the world, and a sign that the Antichrist's power is on the rise:

An Italian man took her [Jeanne Bosdeau] to a field on Saint John's Eve. The man made a large ring with a rod of holly, muttering a few words which he read from a black book. Thereupon appeared a large, horned goat, all black, accompanied by two women, as well as a man dressed as a priest. The goat asked the Italian who this girl was, and having replied that he had brought her to be his, the goat made him make the sign of the cross with his left hand [the sign of the cross was always to be made with the right hand only in the Catholic Church, so this was seen as an inversion of its meaning]. Then he commanded all of them to come and greet him, which they did, kissing his rear. The goat had a lighted black candle between his two horns, from which the others lit their own candles. The goat took the woman aside, laid her in the woods, and carnally knew her, to which she took an extreme displeasure, suffered much pain, and felt his seed as cold as ice. Every Wednesday and Friday of each month the general meeting was held, where she went numerous times, with more than sixty other persons, all of whom carried a black candle, lighted from the candle that the goat had between his horns. After that they all began to dance in circles, their backs turned to one another. The person who was performing the service was clothed in a black robe without a cross. He raised a round slice of turnip, dyed black, instead of the Host, and cried at the Elevation: Master, help us. Water was put in the chalice instead of wine, and to make 'holy water', the goat urinated into a hole on the ground, and the person who was performing the service asperged the attendants with a black asperges (sprinkling of water). In this group they performed the practices of witchcraft, and every one gave a story of what they had done. They were to poison, to bewitch, to bind, to cure illnesses with charms, to make waste the fruits of the earth, and other such maladies.