A worm was any of various elongated, soft-bodied animals that lacked limbs. On Dagobah, there were worms that burrowed into and help aerate soil. Those worms enjoyed soggy earth, which prompted them to surface after rain. On Geonosis, there existed a species of parasitic green worms that could control any organic body, alive or dead, by entering through the nasal cavity. Another parasite, the conduit worm, was known to feed off the electrical wiring of starships. The gargantuan joopa creatures from Seelos were also a type of worm.
- Star Wars: The Clone Wars – "Legacy of Terror" (First appearance)
- Star Wars: The Clone Wars – "Brain Invaders"
- Star Wars Rebels – "The Lost Commanders"
- Heir to the Jedi (Mentioned only)
- The Empire Strikes Back: So You Want to Be a Jedi? (Mentioned only)
- "The Crimson Corsair and the Lost Treasure of Count Dooku"
- Star Wars: Episode VII The Force Awakens junior novelization (Mentioned only)