Which Harry Potter book did J.K. Rowling write under the pseudonym Newt Scamander?

J.K. Rowling wrote Fantastic Beasts and Where to Find Them under the pseudonym Newt Scamander.

The book was first published in 2001 as a companion volume to the Harry Potter series. In the fiction, it is a Hogwarts textbook written by Newt Scamander, a fictional magizoologist. The real edition presents itself as a reproduction of Harry’s school copy, complete with humorous notes attributed to Harry and Ron.

Proceeds from the original charity editions supported Comic Relief and helped fund projects for disadvantaged children. The book is a fictional guide to magical creatures, not a conventional narrative novel. It includes entries on creatures such as the Acromantula, Banshee and Hippogriff.

Rowling later expanded the concept into the Fantastic Beasts film series, for which she wrote the screenplays. The films follow Newt Scamander as an on-screen character, while the 2001 book is framed as an in-world reference text.