2001: A Space Odyssey is a 1968 epic science fiction film produced and directed by Stanley Kubrick. The screenplay was written by Kubrick and Arthur C. Clarke, and was inspired by Clarke's 1951 short story "The Sentinel" and other short stories by Clarke. A novel released after the film's premiere was in part written concurrently with the screenplay. The film, which follows a voyage to Jupiter with the sentient computer HAL after the discovery of an alien monolith affecting human evolution, deals with themes of existentialism, human evolution, technology, artificial intelligence, and the possibility of extraterrestrial life.

The film is noted for its scientifically accurate depiction of space flight, pioneering special effects, and ambiguous imagery. Kubrick avoided conventional cinematic and narrative techniques; dialogue is used sparingly, and there are long sequences accompanied only by music. The soundtrack incorporates numerous works of classical music, among them Also sprach Zarathustra by Richard Strauss, "The Blue Danube" by Johann Strauss II, and works by Aram Khachaturian and György Ligeti.

The film received diverse critical responses, ranging from those who saw it as darkly apocalyptic to those who saw it as an optimistic reappraisal of the hopes of humanity. It was nominated for four Academy Awards, with Kubrick winning for his direction of the visual effects. The film is widely regarded as one of the greatest and most influential films ever made. In 1991, it was deemed "culturally, historically, or aesthetically significant" by the United States Library of Congress and selected for preservation in the National Film Registry.