Parasites were lifeforms that attached themselves and leeched off another to survive. Rock warts, phidna and the brain worms of Geonosis were examples of parasites. Mynocks could survive as parasites inside an exogorth for years before being digested.
- "A Recipe for Death"—Tales from a Galaxy Far, Far Away: Aliens: Volume I (Mentioned only)
- Star Wars: The Clone Wars – "Bounty Hunters" (Mentioned as an insult)
- Star Wars: The Clone Wars – "Legacy of Terror"
- Star Wars: The Clone Wars – "Brain Invaders"
- Star Wars: The Clone Wars – "Orders" (Mentioned only)
- Rogue One: A Star Wars Story novelization
- Doctor Aphra 7: The Screaming Citadel, Part III
- Doctor Aphra 8: The Screaming Citadel, Part V
- Star Wars 33: Rebels in the Wild (Mentioned only; in the opening crawl)
- Star Wars: Episode V The Empire Strikes Back (First appearance)
- Aftermath: Life Debt (Mentioned only)
- Aftermath: Empire's End (Mentioned only)