David Gerard Koepp (born June 9, 1963) is an American screenwriter and director. He is the ninth most successful screenwriter of all time in terms of U.S. box office receipts, with a total gross of over $2.3 billion. Koepp has achieved both critical and commercial success in a wide variety of genres: thriller, science fiction, comedy, action, drama, crime, superhero, horror, adventure, and fantasy.

Some of the best-known films he has written include the sci-fi adventure films Jurassic Park (1993), The Lost World: Jurassic Park (1997), and Indiana Jones and the Kingdom of the Crystal Skull (2008); the crime film Carlito's Way (1993); the action spy films Mission: Impossible (1996) and Jack Ryan: Shadow Recruit (2014); the superhero film Spider-Man (2002); the sci-fi disaster film War of the Worlds (2005); and the mystery thriller Angels & Demons (2009). Koepp has directed seven feature films over the course of his career: The Trigger Effect (1996), Stir of Echoes (1999), Secret Window (2004), Ghost Town (2008), Premium Rush (2012), Mortdecai (2015), and You Should Have Left (2020).