Animagus Registry

"We did Animagi in class with Professor McGonagall. And I looked them up when I did my homework — the Ministry of Magic keeps tabs on witches and wizards who can become animals; there's a register showing what animal they become, and their markings and things… and I went and looked Professor McGonagall up on the register, and there have been only seven Animagi this century, and Pettigrew's name wasn't on the list."

- Hermione Granger.

The Animagus Registry is a Ministry of Magic registry service, presumably under the Department of Magical Law Enforcement. Animagi are required to submit themselves once they acquire the ability to turn into an animal, and failure to do so results in imprisonment in Azkaban.

Appearances

 * Harry Potter and the Prisoner of Azkaban
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Order of the Phoenix
 * Pottermore