The highest yoga tantra goddess, Vajrayogini, is praised and practiced in Buddhist tantra as the embodiment of enlightened wisdom and compassion. This book broaches the Indian origins of her practice prior to 1200 A.D. and sheds light on tantric sadhana meditation more generally. Surveying the manifestations of the goddess in a collection of fifty sadhanas, English pays special attention to the Vajravarahi Sadhana of Umapatideva, and includes a translation of this lengthy and clear text, which has never previously been translated into English.