Which J.K. Rowling book was written as a companion to the Harry Potter novels and published in 2001?

Fantastic Beasts and Where to Find Them was the J.K. Rowling companion book published in 2001.

The book is presented as a Hogwarts textbook by Newt Scamander, a fictional magizoologist. Its fictional ownership note links it to Harry Potter, Ron Weasley, and Hermione Granger, who supposedly used the volume during their school years. The text combines descriptions of magical creatures with humorous annotations attributed to the three students.

Rowling wrote the book to resemble an in-world reference guide rather than a conventional narrative. Proceeds from the original publication benefited Comic Relief, a British charity that uses comedy and entertainment to raise money for people affected by poverty.

The title later inspired a separate film series. The 2016 film Fantastic Beasts and Where to Find Them expands Newt Scamander into a central character and places him in 1920s New York. The book and film share a title and creature-focused premise but are not the same story.