David Duncan (February 17, 1913 – December 26, 1999) was an American screenwriter and novelist.^[1]

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He began writing professionally at the age of 33 after about ten years in government. His screenwriting career began in 1953 with the release of his first film and Paramount's first 3-D film, Sangaree. Duncan is remembered for his work in science fiction such as the films Monster on the Campus (1958), The Time Machine (1960) and Fantastic Voyage (1966). He was credited with writing the English narrative for Rodan (1956). He also wrote for many television series such as National Velvet (1960), The Outer Limits ("The Human Factor", 1963), and Daniel Boone (1964-70). His science fiction novels include Dark Dominion (1954), Beyond Eden (1955), and Occam's Razor (1957). He also wrote six novels outside the genre. Duncan wrote Time Machine: The Journey Back a 48 minute PBS documentary and mini-sequel to George Pal's 1960 movie The Time Machine.