Halloween: "All Hallows Eve", the night of October 31st, when the worlds of spirits and mortals are said to become one.
haruspex: Latin name for a diviner.
haunting: Unexplained events at a particular location, attributed to the presence of spirits or ghosts.
Hecate: In Greek mythology, a demon goddess of witchcraft, darkness and death.
Heptameron: A book dealing with the subjects of spirit invocation and general magic. The authors are unknown, but legend has it that the first part was written by Italian magician Peter of Abano.
Hermann prophesies: A series of prophesies said to have been written by the monk Hermann and published circa 1722.
Hermetica: A school of mystical thought that, together with the Kabbalah, formed the original foundation of Western occultism.
hexagram: in the Chinese I-Ching, a six-line figure used to calculate answers to questions.
Hoagland, Richard: Investigator and researcher into space-related issues and phenomena.
Home, Daniel Dunglas (1833 - 1886): A famous Scottish spiritualist.
homeopathy: A natural medical discipline that combines natural ingredients, typically in immeasurably small doses, to promote health and healing.
horary astrology: A form of astrology in which a question is answered by using a chart based on the time the question is proposed.
horoscope: A foundation concept in astrology that involves interpreting the character and destiny of a person based on celestial positions at the time of birth.
Houdini, Harry: Famous illusionist and escape artist, also known for his interest in (and debunking of) paranormal claims.
Human mysteries: A category of paranormal phenomena relating to the human body and mind.
hydromancy: Any method of divination using water; for example, hearing meaningful sounds in water, interpreting patterns of water disturbance, etc.
hypnosis: A state of mind in which the subject becomes very relaxed and open to suggestion.