Question: who are the hogwarts house ghosts?
Answer: Nearly Headless Nick – the Gryffindor house ghost who is nearly headless because he still has his head. ...  The Bloody Baron – the Slytherin house ghost. ...  The Grey Lady – the Ravenclaw house ghost. ...  The Fat Friar – the Hufflepuff house ghost. ...  Professor Binns – the History of Magic professor at Hogwarts.