Dennis Nedry is the secondary antagonist of the 1990 science fiction novel Jurassic Park by the late Michael Crichton, and its 1993 film adaptation of the same name. He is a troublesome and overweight computer-network engineer for the successful dinosaur-cloning faculty he was ordered to program without many details on what the park actually did and was called to the island to fix numerous bugs in the system.
Due to the low salary that left him struggling to make a living, Nedry turned on park owner John Hammond and stole dinosaur embryos to sell to a rival theme park that has failed to make their own dinosaurs.
His meddling resulted in the dinosaurs escaping and running amok, as well as the deaths of several characters in the film, including himself. He is the archenemy of John Hammond and InGen.