Count Magnus is a short film which is part of the British supernatural anthology series A Ghost Story for Christmas. Produced by Isibeal Ballance and written and directed by Mark Gatiss, it is based on the ghost story of the same name by M. R. James, first published in the collection Ghost Stories of an Antiquary (1904), and first aired on BBC Two on 23 December 2022.

Set in 1863, it stars Jason Watkins as Mr. Wraxhall, a British travelogue writer who visits Sweden whilst writing a guidebook to the country and who becomes fascinated by the story of Count Magnus, a 17th-century landowner who was known for his brutality to his tenants.

The series' creator Lawrence Gordon Clark, who directed all but one of the original 1971–1978 run, had originally wished to adapt "Count Magnus" as early as 1973, but the budget was never sufficient to allow location filming in Sweden, and it remained unproduced as of the series' end. Gatiss, who began helming the series with The Tractate Middoth (2013), finally got the chance to adapt the story, though it was filmed in England. It received mixed reviews from critics, who found it lacking as a work of horror.