Arnold is a given name that can refer to:
- Arnold, the pet Pygmy Puff of Ginny Weasley
- Arnold, a man who left his home for a hunt
- Arnold Peasegood, a Hit Wizard and former Obliviator
- Arnold Streeton, a Ravenclaw student at Hogwarts in the 1990s
- Arnold Vogler, a Quidditch commentator