The Incredible Shrinking Man is a 1957 American science fiction film directed by Jack Arnold, based on Richard Matheson's 1956 novel, The Shrinking Man. The film stars Grant Williams as Scott and Randy Stuart as Scott's wife, Louise. While relaxing on a boat, Scott is enveloped by a strange fog. Months later, he discovers that he appears to be shrinking. By the time Scott has reached the height of a small boy, his condition becomes known to the public. When he learns there is no cure for his condition, he lashes out at his wife. As Scott shrinks to the point where he can fit into a dollhouse, he has a battle with his family cat, leaving him lost and alone in his basement, where he is now smaller than the average insect.

The film's storyline was expanded by Matheson after he had sold the story to Universal-International Pictures Co., Inc. He also completed the novel upon which the film is based while production was underway. Matheson's script was initially written in flashbacks, and Richard Alan Simmons rewrote it using a more conventional narrative structure. Director Jack Arnold initially wanted Dan O'Herlihy to play Scott, but O'Herlihy turned down the role, leading Universal to sign Williams as the lead. Filming began on May 31, 1956. Scenes involving special effects were shot throughout production, while others used the large sets of Universal's backlot. Production went over budget, and filming had to be extended; certain special effects shots required reshooting. Williams was constantly being injured on set.

Before the film's release in New York City on February 22, 1957, its ending first went to test audiences who felt the character's fate should be changed. The director's original ending remained in the film. The film grossed $1.43 million in the United States and Canada and was among the highest-grossing science fiction films of the 1950s. A sequel, The Fantastic Little Girl, originally penned by Matheson, never went into production. A remake was developed years later, eventually becoming the comedy The Incredible Shrinking Woman (1981). Other remakes were planned in the early 2000s, one of which was to star Eddie Murphy in a more comedic variation on the film. A new adaptation was announced in 2013, with Matheson writing the screenplay with his son Richard Christian Matheson. In 2009, the film was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant."