What is the name of the ghost of Gryffindor Tower?

The ghost of Gryffindor Tower is Nearly Headless Nick, whose formal name is Sir Nicholas de Mimsy-Porpington. He is the resident ghost associated with Gryffindor House and frequently appears around Hogwarts alongside Harry, Ron, and Hermione.

Nick’s nickname comes from his execution: his neck was almost, but not completely, severed by a blunt axe. Because his head remained attached by a small strip of skin, he became “Nearly Headless” rather than fully headless. He celebrates his deathday on 31 October, the same date as his execution in 1492.

The other options belong to different Hogwarts associations. The Fat Friar is linked with Hufflepuff, while the Grey Lady is Ravenclaw’s house ghost. Peeves is not a ghost at all; he is a poltergeist, a mischievous magical being who haunts the school. Nearly Headless Nick also belongs to the Headless Hunt, a group he desperately wants to join despite not being completely headless.