The Hogwarts librarian has many duties, including:
- Monitoring the Library.
- Maintain circulation files, statistics, inventories and records of which books are in the library at any given time and where in the library they can be found.
- Keeps the library organized, clean and neat
- Selects, purchases and cataloging new materials for the library and assure a balanced collection which offers diverse points of view on magical studies to ensure learning efficiency.
- Classify and catalog library books in order to properly making them ready for checkout, and to assist students and staff members in finding the desired reading material.
- See to it that the deadline given to the students for the return of a library book are being followed.
- Magically expand the space in the bookcases in the various sections of the library to accommodate more books if necessary.
- Establish and implement and enforce formerly implemented rules and regulations for being in the library.
- Check the authenticity of written permissions from the faculty before students can enter the Restricted Section at the Library.
- Keeping track of which books have been lent out, which student it is that lent which books and ensure that the deadline for when the books are to be returned to their shelves are uphold.
- To help students in academical research by assisting them in identifying, locating and interpret information.
- Keeping himself/herself well-informed on current literature.
- Making sure all students have left the library by 8:00 pm, at which time the library closes.
- Oversee the Study Hall.
Known Hogwarts librarians
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Philosopher's Stone (video game) (GBC and GBA versions only)
- Harry Potter and the Chamber of Secrets
- Harry Potter and the Chamber of Secrets (film)
- Harry Potter and the Chamber of Secrets (video game) (GBC and PS2 versions only)
- Harry Potter and the Prisoner of Azkaban (video game) (Mentioned only)
- Harry Potter and the Goblet of Fire
- Harry Potter and the Order of the Phoenix
- Harry Potter and the Order of the Phoenix (video game) (Mentioned only)
- Harry Potter and the Half-Blood Prince
- Quidditch Through the Ages
- LEGO Harry Potter: Years 1-4
- LEGO Harry Potter: Years 5-7
- Harry Potter Trading Card Game