Nargles are known to infest mistletoe, and to be mischievous thieves. Luna Lovegood claimed that her Butterbeer cork necklace kept the Nargles away and that her papers and shoes were taken by Nargles.
- Cho Chang: "Mistletoe"
- Harry Potter: "Yeah, it's probably full of Nargles though."
- Cho Chang: "What are Nargles?"
- Harry Potter: "No idea, you'd have to ask Loony. Luna, I mean"
- — Cho and Harry discussing the Nargles[src]
For the last Dumbledore's Army meeting of 1995, Dobby decorated the Room of Requirement with some Mistletoe. Luna Lovegood was complimentary of this, as she dreamily claimed that the plant was infested with Nargles. Later, When Harry Potter and Cho Chang were about to kiss under the mistletoe just prior to Christmas 1995, Harry joked that Nargles may be infesting it. Cho, who had never heard Luna discuss her belief in this creature, was confused, so Harry let the topic drop.
- Harry Potter and the Order of the Phoenix (First mentioned)
- Harry Potter and the Order of the Phoenix (film) (Mentioned only)
- Harry Potter and the Order of the Phoenix (video game) (Mentioned as Fairy Nargle in Daily Prophet)
- Harry Potter and the Half-Blood Prince (video game) (Mentioned only)
- Harry Potter and the Deathly Hallows (Mentioned only)
- Harry Potter and the Deathly Hallows: Part 1 (video game) (Mentioned only)
- LEGO Harry Potter (Mentioned only)
- LEGO Dimensions (Mentioned only)