Iconic theatrical publicity photograph featuring Boris Karloff (The Monster) frantically walking down the the stone steps leading to the dungeon.

Frankenstein is a 1931 American pre-Code science fiction horror film directed by James Whale, produced by Carl Laemmle Jr., and adapted from a 1927 play by Peggy Webling, which in turn was based on Mary Shelley's 1818 novel Frankenstein; or, The Modern Prometheus. The Webling play was adapted by John L. Balderston and the screenplay written by Francis Edward Faragoh and Garrett Fort, with un-credited contributions from Robert Florey and John Russell.

Frankenstein stars Colin Clive as Henry Frankenstein, an obsessed scientist who digs up corpses with his assistant in order to assemble a living being from body parts. The resulting creature, often known as Frankenstein's monster, is portrayed by Boris Karloff. The make-up for the monster was provided by Jack Pierce. Alongside Clive and Karloff, the film's cast also includes Mae Clarke, John Boles, Dwight Frye, and Edward Van Sloan.

Produced and distributed by Universal Pictures, the film was a commercial success upon release, and was generally well received by both critics and audiences. It spawned a number of sequels and spin-offs, and has had a significant impact on popular culture: the imagery of a maniacal "mad" scientist with a subservient hunchbacked assistant and the film's depiction of Frankenstein's monster have since become iconic. In 1991, the United States Library of Congress selected Frankenstein for preservation in the National Film Registry as being "culturally, historically, or aesthetically significant".

In 1930, Universal Studios had lost $2.2 million in revenues. Within 48 hours of its opening at New York's Roxy Theatre on February 12, 1931, Dracula starring Bela Lugosi had sold 50,000 tickets, building a momentum that culminated in a $700,000 profit, the largest of Universal's 1931 releases. As a result, the head of production, Carl Laemmle Jr., announced immediate plans for more horror films. It purchased the film rights to John L. Balderston's planned stage adaptation of Peggy Webling's British stage adaptation of Mary Wollstonecraft Shelley's original novel.

Kenneth Strickfaden designed the electrical effects that were used in the "creation scene". They were so successful that such effects came to be considered an essential part of every subsequent Universal film involving Frankenstein's Monster. Accordingly, the equipment used to produce them has come to be referred to in fan circles as "Strickfadens". It appears that Strickfaden managed to secure the use of at least one Tesla Coil built by the inventor Nikola Tesla himself. The film opened in New York City at the Mayfair Theatre on December 4, 1931, and grossed $53,000 in one week.

Florey and Lugosi were given the Murders in the Rue Morgue film, as a consolation. Lugosi would later go on to play Frankenstein's Monster in Frankenstein Meets the Wolf Man a decade later, when his career was in decline (in the original shooting script the Monster spoke, cancelling Lugosi's initial objection to the part, but his filmed dialogue sequences were cut prior to release, along with the premise that the Monster was blind, which was the way Lugosi had played it).

The scene in which the Monster throws the little girl, Maria, into the lake and accidentally drowns her has long been controversial. Upon its original 1931 release, the second part of this scene was cut by state censorship boards in Massachusetts, Pennsylvania, and New York. Those states also objected to a line they considered blasphemous that occurred during Frankenstein's exuberance when he first learns that his creature is alive.