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A psychic vampire is a person or being who feeds off the "life force" of other living creatures. Psychic vampires are represented in the occult beliefs of various cultures and in fiction. There is no scientific or medical evidence supporting the existence of psychic vampires, or even the bodily or psychic energy they allegedly drain.
The term psychic vampire is sometimes abbreviated psy-vamp (or psi-vamp). Alternate terms for these entities include energy vampire, energy predator, energy parasite, energy eater and energivore, as well as psionic vampire, pranic vampire, and empathic vampire.
The term "energy vampire" is also used metaphorically to refer to people whose influence leaves a person feeling exhausted, unfocused, and depressed, without ascribing the phenomenon to psychic interference. 
Dion Fortune wrote of psychic parasitism in relation to vampirism as early as 1930 in her book, Psychic Self-Defense. Fortune considered psychic vampirism a combination of psychic and psychological pathology, and distinguished between what she considered to be true psychic vampirism and mental conditions that produce similar symptoms. For the latter, she named folie à deux and similar phenomena.
The term "psychic vampire" was popularized in the 1960s by Anton LaVey and his Church of Satan. LaVey wrote on the topic in his book, The Satanic Bible, and claimed to have coined the term. LaVey used psychic vampire to mean a spiritually or emotionally weak person who drains vital energy from other people, or a paranormal entity within such a person, allowing the psychic draining of energy from other people. Adam Parfrey likewise attributed the term to LaVey in an introduction to The Devil's Notebook.
The terms "energy vampire" and "psychic vampire" have been used as synonyms in Russia since the fall of the Soviet Union as part of an occult revival.
The theme of the psychic vampire has been a focus within modern vampire subculture. The way that the subculture has manipulated the image of the psychic vampire has been investigated by researchers such as Mark Benecke and A. Asbjorn Jon. Jon has noted that, like the traditional psychic vampires, those of vampire subculture believe that they 'prey upon life-force or 'pranic' energy'.
A related form of psychic vampirism is known as sexual vampirism, where one is said to be able to feed off sexual energy. A mythological example of a sexual vampire would be a succubus or a rokurokubi.
LaVey defines psychic vampires as "individuals who drain others of their vital energy... They fill no useful purpose in our lives, and are neither love objects nor true friends.