Augustus Montague Summers (10 April 1880 – 10 August 1948) was an English author and clergyman. He is known primarily for his scholarly work on the English drama of the 17th century, as well as for his idiosyncratic studies on witchcraft, vampires, and werewolves, in all of which he professed to believe. He was responsible for the first English translation, published in 1928, of the 15th-century witch hunter's manual, the Malleus Maleficarum.Summers' career as an ostensibly Catholic clergyman was highly unusual. Although he wrote works of hagiography on Catherine of Siena and Anthony Maria Zaccaria, his primary religious interest was in the subject of the occult. While Aleister Crowley, with whom he was acquainted, adopted the persona of a modern-day witch, Summers played the part of the learned Catholic witch-hunter. In the introduction to his book on The History of Witchcraft and Demonology (1926) he writes:

In the following pages I have endeavoured to show the witch as she really was – an evil liver: a social pest and parasite: the devotee of a loathly and obscene creed: an adept at poisoning, blackmail, and other creeping crimes: a member of a powerful secret organisation inimical to Church and State: a blasphemer in word and deed, swaying the villagers by terror and superstition: a charlatan and a quack sometimes: a bawd: an abortionist: the dark counsellor of lewd court ladies and adulterous gallants: a minister to vice and inconceivable corruption, battening upon the filth and foulest passions of the age.

In 1928, he published the first English translation of Heinrich Kramer's Malleus Maleficarum ("The Hammer of Witches"), a 15th-century Latin manual on the hunting of witches. In his introduction, Summers insists that the reality of witchcraft is an essential part of Catholic doctrine and declares the Malleus an admirable and correct account of witchcraft and of the methods necessary to combat it. In fact, however, the Catholic authorities of the 15th century had condemned the Malleus on both ethical and legal grounds.[4] Other Catholic scholars contemporary with Summers were also highly critical of the Malleus. For instance, the Rev. Herbert Thurston's article on "Witchcraft" for the Catholic Encyclopaedia of 1912, refers to the publication of the Malleus as a "disastrous episode."[5]

Montague Summers then turned to vampires, producing The Vampire: His Kith and Kin (1928) and The Vampire in Europe (1929), and later to werewolves with The Werewolf (1933). Summers' work on the occult is notorious for his unusual and old-fashioned writing style, his display of erudition, and his purported belief in the reality of the subjects he treats.