Frankenstein is a novel written by English author Mary Shelley about eccentric scientist Victor Frankenstein, who creates a grotesque creature in an unorthodox scientific experiment. Shelley started writing the story when she was eighteen, and the novel was published when she was twenty. The first edition was published anonymously in London in 1818. Shelley's name appears on the second edition, published in France in 1823.

Shelley had traveled to Europe, visiting Germany and Switzerland. In 1814, prior to writing the famous novel, Shelley took a journey on the river Rhine in Germany with a stop in Gernsheim which is just 17km (10mi) away from Frankenstein Castle, where two centuries before her visit an alchemist was engaged in experiments. Later, she traveled in the region of Geneva (Switzerland)—where much of the story takes place—and the topics of galvanism and other similar occult ideas were themes of conversation among her companions, particularly her lover and future husband, Percy Shelley. Mary, Percy, Lord Byron, and John Polidori decided to have a competition to see who could write the best horror story. After thinking for days about what her possible storyline could be, Shelley dreamt about a scientist who created life and was horrified by what he had made; her dream later evolved into the story within the novel.

Frankenstein is infused with elements of the Gothic novel and the Romantic movement and is also considered to be one of the earliest examples of science fiction. Brian Aldiss has argued that it should be considered the first true science fiction story, because unlike in previous stories with fantastical elements resembling those of later science fiction, the central character "makes a deliberate decision" and "turns to modern experiments in the laboratory" to achieve fantastic results. It has had a considerable influence across literature and popular culture and spawned a complete genre of horror stories, films, and plays.

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