The Astronomy department is a group of professors who teach Astronomy at Hogwarts School of Witchcraft and Wizardry. The number of teachers in the department is unknown, although Professor Aurora Sinistra is a known member. Their residence is presumably the Astronomy Tower, where their lessons are taught.
- Harry Potter and the Philosopher's Stone (film) (Sinistra appeared)
- Harry Potter and the Chamber of Secrets (Department mentioned, Sinistra appeared)
- Harry Potter and the Goblet of Fire (Sinistra appeared)
- Harry Potter and the Order of the Phoenix (Sinistra appeared)