Kennilworthy Whisp is a pseudonym used by J. K. Rowling, the world-renowned British author best known for the Harry Potter series. Under this pen name, Rowling authored Quidditch Through the Ages, a companion book to the main series. This publication is presented as a non-fiction book within the fictional universe of Harry Potter, purporting to be a copy from the Hogwarts library. It focuses on the history and intricacies of Quidditch, the popular magical sport in Rowling's universe.

The book was released in 2001 and has since become a beloved addition to the Harry Potter lore. Beyond its entertainment value, Quidditch Through the Ages serves a philanthropic purpose as well. A significant portion of the book's cover price is donated to Comic Relief, a charity affiliated with the BBC. Over 80% of proceeds go directly to aiding children in need across various regions of the world.