What film did Dalí co-direct with Luis Buñuel in 1929?

The film Dalí made with Luis Buñuel in 1929 was Un Chien Andalou, a French silent short and landmark of Surrealist cinema.

The project grew from dreams shared by Buñuel and Dalí. Buñuel described a cloud cutting across the moon like a razor slicing an eye, while Dalí recalled a hand covered with ants. They combined these images into a deliberately irrational film whose scenes follow dream logic rather than a conventional plot. The famous opening image of an eye being cut with a razor established its confrontational style.

A useful correction to the question’s wording is that Buñuel directed, produced, and edited the film, while Dalí co-wrote the screenplay and contributed to its conception. “Co-directed” is therefore a common simplification, but Un Chien Andalou remains the canonical answer. Its later sequel, L’Âge d’Or, was also a Buñuel–Dalí collaboration, which is why it is sometimes confused with the 1929 film.