Leslie Dilley (January 11, 1941 — May 20, 2025) was a Welsh art director and production designer. During his career from the 1970s to 2000s, he won the Academy Award for Best Art Direction twice for Star Wars (1977) and Raiders of the Lost Ark (1981). Dilley received additional Best Art Direction nominations for Alien (1979), The Empire Strikes Back (1980), and The Abyss (1989). Apart from art direction, Dilley was a production designer for The Exorcist III (1990), Casper (1995), and Son of the Mask (2005).