The graboid, also called the dirt dragon, is a fictional invertebrate species that is the primary antagonist of the Tremors series. The creature made its debut in the 1990 film Tremors, and reappeared in its sequels Tremors 2: Aftershocks (1996), Tremors 3: Back to Perfection (2001), and Tremors 4: The Legend Begins (2004). It has also appeared in the series' spinoff Tremors: The Series (2003).

The details of the graboid design have changed significantly between the transition from the script to the final film – the tongues of the original graboids were equipped with slashing beaks rather than jaws, and the graboid's beak was pointed like a corkscrew. At one point during the production, the graboid design featured a fleshy, retractable membrane which covered the head. Jokingly referred to as a "foreskin" by the production crew, the membrane was removed and replaced with the hard beak present on the final design to make it appear less phallic.

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