To protect the wizarding world from the dragons
- Unidentified wizard #1: "I pull down about a hundred sacks of Galleons a year! I'm a dragon killer for the Committee for the Disposal of Dangerous Creatures."
- Unidentified wizard #2: "No, you're not! You're a dishwasher at the Leaky Cauldron… but I'm a Vampire Hunter, I've killed about ninety so far -"
- — A group of wizards fighting over the affections of a group of Veelas[src]
A dragon killer is someone who presumably kills dragons for the Committee for the Disposal of Dangerous Creatures as an occupation. During the Quidditch World Cup in 1994 an unidentified wizard was trying to impress a group of Veelas and claimed to be a dragon killer who earned "a hundred sacks of Galleons a year". Another unidentified wizard spoke up claiming that the supposed dragon killer was in fact a dishwasher at the Leaky Cauldron and that he was a Vampire Hunter himself.
- Harry Potter and the Goblet of Fire (Mentioned only)