A Grindylow is a small, horned water demon that lives in the weed beds at the bottom of lakes in Great Britain and Ireland. It has green teeth, pointy horns and long fingers, which are used to strangle their prey. They are violent and aggressive towards wizards and witches and Muggles, although merpeople have been known to domesticate them and keep them as pets.

Grindylows inhabit Black Lake at Hogwarts School of Witchcraft and Wizardry, and they attacked students competing in the 1995 Triwizard Tournament, forcing the retirement of Fleur Delacour. In Harry Potter's third year at Hogwarts, Remus Lupin tells Harry that the trick to combating them is to break their grip; their abnormally long fingers are strong but very brittle.

Grindylows mostly survive on fish, algae, and small sea creatures. They are usually not a threat but have been known to eat humans, for this reason Grindylows are considered 'Dark Creatures'.

Behind the scenesEdit

• The appearance and background of the grindylow is strongly reminiscent of creatures from the "Xenomorph" of the "Alien" franchise (particularly the instances of anthropophagy) and probably draw inspiration from them.

AppearancesEdit

• Harry Potter and the Prisoner of Azkaban (First appearance)
• Harry Potter and the Goblet of Fire
• Harry Potter and the Goblet of Fire (film)
• Harry Potter and the Goblet of Fire (video game)
• Harry Potter and the Deathly Hallows (Mentioned only)
• Harry Potter and the Deathly Hallows: Part 1 (Mentioned only)
• Fantastic Beasts and Where to Find Them
• LEGO Harry Potter: Years 1-4

Defence Against the Dark Arts (D.A.D.A.)
Professors: Galatea Merrythought · Quirinus Quirrell · Gilderoy Lockhart · Remus Lupin · Barty Crouch Jr. (as Alastor Moody) · Dolores Umbridge · Severus Snape · Amycus Carrow
Textbooks: The Dark Forces: A Guide to Self-Protection · Break with a Banshee · Gadding with Ghouls · Holidays with Hags · Travels with Trolls · Voyages with Vampires · Wanderings with Werewolves · Year with the Yeti · Defensive Magical Theory · Confronting the Faceless
D.A.D.A. at Hogwarts: Classroom 3C · Temporary Classroom · Tower · Professor's Office · Storeroom · Staircase · Lesson Cup · Race Cup · Dumbledore's Army
Spells covered under the subject: Curse of the Bogies · Knockback Jinx · Verdimillious (uno, duo & tria) · Wand-Lighting Charm · Glacius · Patronus Charm · Killing Curse · Cruciatus Curse · Imperius Curse · Impediment Jinx · Reductor Curse · Stunning Spell · Shield Charm · Nonverbal spells · Inferius
Creatures covered under the subject: Vampire bats · Iguanas · Cornish Pixies · Werewolves · Vampires · Hinkypunks · Boggarts · Red Caps · Kappas · Grindylows