The Book of Shadows is a magic book owned by the Charmed Ones. It contains spells, potions, and information on their enemies. The Book has been enchanted to protect itself, causing it to move away whenever any evil being attempts to touch it. It has a large triquetra set on its front cover, symbolizing the Power of Three.

The ancestor of the Charmed Ones, Melinda Warren began the Book of Shadows in the late 1600s. The book was then handed down from mother to daughter for more than three hundred years, until it was inherited by Prue, Piper, Phoebe, and Paige upon the death of their grandmother Penny.