A Book of Shadows is a book containing religious text and instructions for magical rituals found within the Neopagan religion of Wicca. Since its conception, it has made its way into many pagan practices and paths. The most famous Book of Shadows was created by the pioneering Wiccan Gerald Gardner sometime in the late 1940s or early 1950s, and which he utilised first in his Bricket Wood coven and then in other covens which he founded in following decades. The Book of Shadows is also used by other Wiccan traditions, such as Alexandrian Wicca and Mohsianism, and with the rise of books teaching people how to begin following non-initiatory Wicca in the 1970s onward, the idea of the Book of Shadows was then further propagated amongst solitary practitioners unconnected to earlier, initiatory traditions.

Doreen Edith Dominy Valiente was an English Wiccan who was responsible for writing much of the early religious liturgy within the tradition of Gardnerian Wicca. An author and poet, she also published five books dealing with Wicca and related esoteric subjects.