Gobbledegook is the native language of the goblins. Barty Crouch Sr., Dirk Cresswell, and Albus Dumbledore are known non-Goblin speakers. It has been described as a harsh, rasping language, which makes it sound distinctly inhuman.
- Gobbledegook is one of the seventy-two languages in which Miranda Goshawk's Book of Spells was published in.
- In the Three Broomsticks Inn, it is spoken by two goblins defrauded by Ludovic Bagman in 1995.
- In 1997 when Harry Potter, Hermione Granger, and Ronald Weasley overhear fellow fugitives Dirk Cresswell and the Goblins Gornuk and Griphook converse in Gobbledegook, while they were on the run from the Snatchers.
- Bladvak means "pickaxe" in Gobbledegook, according to Ludovic Bagman.
Gobbledygook, or Gibberish, are words that are nonsense.