The Amazing Mr. X, also known as The Spiritualist, is a 1948 thriller film directed by Bernard Vorhaus with cinematography by John Alton. Like the film noir Nightmare Alley released a year earlier, this film tells the story of a phony spiritualist racket.

The film stars Turhan Bey, Lynn Bari, Cathy O'Donnell, and Richard Carlson. Carole Landis was originally hired to play the part taken by Bari, but Landis committed suicide a few days before shooting began.

Two years after her husband's death, Christine Faber (Lynn Bari) thinks she hears her late husband (Donald Curtis) calling out of the surf on the beach one night.

She meets a tall dark man (Turhan Bey) who seems to know all about her.

After more ghostly manifestations, Christine and her younger sister (Cathy O'Donnell) become enmeshed in the strange life of Alexis; but he in turn finds himself manipulated into deeper cruelness than he had in mind.