"Count Magnus" is a ghost story by British writer M. R. James, first published in 1904. It was included in his first collection Ghost Stories of an Antiquary.

Count Magnus is a British supernatural television film broadcast on BBC Two on 23 December 2022 as part of the BBC's Christmas festive programmes. The thirty-minute film is one of the BBC’s A Ghost Story for Christmas series and was written and directed by Mark Gatiss, based on the 1904 short story of the same name by M. R. James.