The Ash Tree is a short film which is part of the British supernatural anthology series A Ghost Story for Christmas. Written by David Rudkin, produced by Rosemary Hill, and directed by the series' creator, Lawrence Gordon Clark, it is based on the ghost story "The Ash-tree" by M. R. James, first published in the collection Ghost Stories of an Antiquary (1904), and first aired on BBC1 on 23 December 1975.

It stars Edward Petherbridge in the dual role of Sir Richard, an 18th century aristocrat who inherits the estate of his late uncle, and of Sir Matthew, his 17th century ancestor whose role in the witch trial of Ann Mothersole (Barbara Ewing) haunts Sir Richard via nighttime visions. Sir Richard is also disturbed by strange noises coming from an ash tree outside his bedroom window, which is revealed to have a connection with these events.

Since airing it has received a mixed response from critics in comparison with the other James adaptations produced in the series' original run, with even Clark regarding it as a disappointment. It was the last James adaptation produced as part of the series' original run, and the last one to air until A View from a Hill (2005).