Which 2001 charity book by J.K. Rowling was written as a Hogwarts library textbook?

J.K. Rowling’s 2001 charity book written as a Hogwarts library textbook is Quidditch Through the Ages.

Quidditch Through the Ages was published under the fictional authorship of Kennilworthy Whisp, a detail that makes the book resemble an in-world reference work. It describes the history and development of the wizarding sport, including equipment, teams, rules, and famous moments.

The book was issued alongside Fantastic Beasts and Where to Find Them, with proceeds supporting Comic Relief. Both slim volumes were presented as books associated with Harry Potter’s school life, but they serve different purposes: one covers the sport of Quidditch, while the other catalogs magical creatures.

This title is distinct from The Tales of Beedle the Bard, another Rowling charity book that appeared in 2008. Beedle the Bard is a collection of wizarding fairy tales, whereas Quidditch Through the Ages is framed as a nonfiction-style sporting history.