Magic libraries (synonyms: houses of knowledge, studies, athenaeums, bibliotheca; example toponyms: The Great Library of Vernisse, the Unknown University Library) are fantasy libraries that contain spell books or magical scrolls, histories of great wizards, potion recipes, and other arcane knowledge. They be in hidden locations, lost to time, found within schools of magic, or in modern fantasy worlds, just down the street. Like libraries, they may have been razed long ago and exist as ruins. Magic libraries may contain hidden doors, secret rooms, and restricted sections. There may be fireplaces and dens in which to read and learn. They are home to student wizards, cultists, and librarians.

Magic libraries, being magic, may contain portals, rooms that defy dimension, and shifting rooms.