Ernie is a given name or nickname that can refer to:
- Ernie Azan, a student at Hogwarts School of Witchcraft and Wizardry in the 21st century
- Ernest "Ernie" Macmillan, a Hufflepuff student at Hogwarts School of Witchcraft and Wizardry in the 1990s
- Ernest "Ernie" Prang, the driver of the Knight Bus