Isis Unveiled is a two-volume classic of esoteric philosophy which discusses occult science and the hidden and unknown forces of nature as well as the similarity of Christian scripture to Eastern religions such as Buddhism, Hinduism, the Vedas, and Zoroastrianism. The book follows the Renaissance notion of prisca theologia, in that all these religions purportedly descend from a common source; the ancient "Wisdom-Religion".

Helena Petrovna Blavatsky was a Russian occultist, philosopher, and author who co-founded the Theosophical Society in 1875. She gained an international following as the leading theoretician of Theosophy, the esoteric religion that the society promoted. Informally, she is also widely known as Madame Blavatsky.