In popular culture
- Lloyd Alexander's The Chronicles of Prydain include a race of Fair Folk similar to the Tylwyth Teg (which here is the name given to their underground kingdom).
- Joan Aiken's 1968 novel The Whispering Mountain explains the Tylwyth Teg as a diminutive Mediterranean race who were imported to Wales as slaves to work in the mines.
- Jim Butcher's short story "Curses" set in the Harry Dresden universe has the Tylwyth Teg responsible for the Curse of the Billy Goat on the Chicago Cubs.
- Mercedes Lackey's novel Home from the Sea features the Tylwyth Teg as mischievous elemental sprites.
- C. Robert Cargill's novel Dreams and Shadows features the Tylwyth Teg (referring to it as a Bendith Y Mamau) as a child snatcher.
- In Michael Swanwick's fantasy novel The Iron Dragon's Daughter the Tylwyth Teg are the aristocracy of the magical world.
- In Kelley Armstrong's fantasy novel series Cainsville the Tylwyth Teg and Annwn are the main themes, but it is not initially obvious until the later books when the history of such myths are revealed.
- Seanan McGuire's October Daye series of books features a Tylwyth Teg character as an alchemist.
- In Frank Herbert's science fiction novel Heretics of Dune, the name of the Master of Masters of Bene Tleilax is Tylwith Waff and his look is similar to a small elf. Another key character is called Miles Teg.