Thorn may refer to:
- Sally McKnight: Nicknamed "Thorn," she is the lead singer of the Hex Girls in standard continuity, who first appeared in the DTV Scooby-Doo and the Witch's Ghost.
- Thorn: The lead singer of the Hex Girls in the Scooby-Doo! Mystery Incorporated TV series continuity.
- Thorn: He was one of the sea creatures in the Be Cool, Scooby-Doo! episode All Paws on Deck.