The Amazing Mr. X, also known as The Spiritualist, is a 1948 American horror thriller film noir directed by Bernard Vorhaus with cinematography by John Alton. The film tells the story of a phony spiritualist racket. The film is prominently featured in Alton's book on cinematography Painting with Light (1949).

The film stars Turhan Bey, Lynn Bari, Cathy O'Donnell, and Richard Carlson. Eagle-Lion Films signed a contract with Carole Landis for the part played by Bari, but Landis committed suicide a few days before filming began. The film is in the public domain.