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Classrooms are where a class of students is taught. In Hogwarts School of Witchcraft and Wizardry, several subjects have lessons take place in varying classrooms throughout the castle.
- The Potions Classroom was one of the large dungeons in Hogwarts Castle, used for Potions lessons. It is large enough to allow at least twenty students to work and its walls are lined with pickled animals in glass jars. In one corner of the room stands a basin into which ice-cold water pours from a gargoyle's mouth, while in another is a student supply cupboard. There is also a blackboard on which the Potions Master can write the class's instructions. The room is especially cold, particularly in the winter when students are able to see their own breath.
- Classroom 1B, also known as the Transfiguration Classroom, is a classroom on the ground-floor of Hogwarts Castle, accessible from the Middle Courtyard.
- Classroom Eleven is a classroom in the ground-floor corridor leading off of the Entrance Hall on the opposite side to the Great Hall. It was one of several classrooms which were not regularly used and, as such, had the slightly neglected feeling of a cupboard or storeroom.
- The History of Magic Classroom (designated Classroom 4F) is where History of Magic classes are taught at Hogwarts School of Witchcraft and Wizardry. It is located on the first floor of Hogwarts Castle.
- The Muggle Studies Classroom is where Muggle Studies classes are taught at Hogwarts School of Witchcraft and Wizardry. It is located on the first floor of Hogwarts Castle.
- Classroom 3C, also known as the Defence Against the Dark Arts Classroom, is where Defence Against the Dark Arts class is taught. It is located off of the Serpentine Corridor on the third-floor. An iron chandelier hung from the ceiling, as well as a dragon's skeleton. On one end of the classroom stands a projector that is activated by magic. There is also a blackboard at the front of the classroom. Several desks and tables can be found in the classroom as well as some sets of large windows. The classroom decoration had several changes over the years, spanning from lots of pictures of Gilderoy Lockhart to tons of skeletons and Shrunken Heads.
- The Charms Classroom (designated Classroom 2E) is where Charms classes are taught at Hogwarts School of Witchcraft and Wizardry, and it is located on the third floor, on the Charms corridor, near another classroom. The classroom has three rows of desks, all facing the teacher's table, behind which sits a large upholstered chair with a high back. Two blackboards flank the teacher's table, and behind them is a small shelf with books and other objects, beneath a pair of windows.
- The Divination Classroom is where Divination classes are taught at Hogwarts School of Witchcraft and Wizardry. It is located in the North Tower. It is accessible through a circular trapdoor and is described as looking like a cross between somebody's attic and an old-fashioned teashop. The classroom is located at the top of the Divination Stairwell, connected to the rest of the castle by the long corridor.
