Denis John "Jack" Hildyard[1] BSC (17 March 1908 – 5 September 1990) was an English cinematographer.

He worked on more than 80 films during his career, spanning from the 1930s through the 1980s, and was a founding member of the British Society of Cinematographers.

He had a younger brother, David (1916-2008), who was a two-time Oscar winning sound engineer.

He made several films with David Lean including The Sound Barrier (1952) and Hobson's Choice (1954), as well as The Bridge on the River Kwai (1957), for which he won an Academy Award for Best Cinematography and the British Society of Cinematographers Award.

[5] His other films included Caesar and Cleopatra (1945), Anastasia (1956), The Sundowners (1960), 55 Days at Peking (1963), Battle of the Bulge (1965), Casino Royale (1967), Topaz (1969), The Beast Must Die (1974), Emily (1976), and The Wild Geese (1978).