The following fictional characters are staff members and denizens of Hogwarts in the Harry Potter books written by J. K. Rowling. The characters of Albus Dumbledore, Severus Snape and Rubeus Hagrid have their own articles.

Dolores Umbridge is listed under Ministry of Magic. Remus Lupin and Alastor Moody are listed under Order of the Phoenix, while Barty Crouch, Jr (who impersonated Moody), and siblings Alecto and Amycus Carrow are listed under Death Eater. Argus Filch is the caretaker of Hogwarts.

While he is not a wholly evil character, he is certainly both short- and ill-tempered, which has made him very unpopular with the student body, and occasionally with some teachers. His knowledge of the secrets and shortcuts of the castle is almost unparalleled, except perhaps by the Weasley twins and users of the Marauder's Map. He has been known to favour almost sadistically harsh punishments, leading to his alliance with Dolores Umbridge when she imposes such, and to have an obsessive dislike of mud, animate toys, and all other things that might interfere with his creation of an immaculately clean Hogwarts.

Filch is revealed to be a Squib in Harry Potter and the Chamber of Secrets when Harry Potter accidentally discovers he is trying to teach himself basic magic from a Kwikspell correspondence course. His inability to use magic in a setting where it would greatly help his duties and the fact that students are learning magic all around him are likely causes of his bitterness. Nonetheless, Filch is at least able to use wizarding devices that have their own innate magic, such as the Secrecy Sensor used in Harry Potter and the Half-Blood Prince.

In the final book, when the school starts preparing itself for the Battle of Hogwarts, Filch is seen grumbling that students are out of bed. He is later seen overseeing the evacuation of younger students.

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