Deities & Demigods, alternatively known as Legends & Lore, is a reference book for the Dungeons & Dragons fantasy role-playing game (D&D). The book provides descriptions and game statistics of gods and legendary creatures from various sources in mythology and fiction, and allows dungeon masters to incorporate aspects of religions and mythos into their D&D campaigns.

James Michael Ward III was an American game designer and fantasy author who worked for TSR, Inc. for more than 20 years, most notably on the role-playing game Dungeons & Dragons. He wrote various books relating to Dungeons & Dragons, including guidebooks such as Deities & Demigods, and novels including Pool of Radiance, based on the computer game of the same name.