Arithmancy is a branch of magic concerned with the magical properties of numbers. As neither Harry nor Ron take this class, almost nothing is known about it. It is, however, a favourite subject of Hermione. Arithmancy is reportedly difficult, as it requires memorising or working with many charts. The subject is taught by Professor Septima Vector.

Astronomy classes take place in the Astronomy Tower, the tallest tower in Hogwarts, and are taught by Professor Aurora Sinistra. Lessons involve observations of the night skies with telescopes. No astronomy lessons are shown in the books, but plenty of references to them. However, Rowling describes one of Harry's Astronomy exams in Harry Potter and the Order of the Phoenix. Also, bits of the Astronomy Tower are seen throughout the film series, such as HP2 and HP3, and featured in The Half-Blood Prince, as the place where Dumbledore died, and seen in The Deathly Hallows. Known student homework activities include learning the names of stars, constellations and planets, and their location, movements, and environments.

Care of Magical Creatures is the class which instructs students on how to care for magical beasts. Classes are held outside the castle. In Harry's first two years, the class is taken by Professor Silvanus Kettleburn who then retires "in order to enjoy more time with his remaining limbs". Dumbledore then recruits the gamekeeper Rubeus Hagrid to accept a teaching position along with his gamekeeping duties. Although Hagrid is obviously very experienced and knowledgeable, he consistently misjudges the risk that the animals he uses in his lessons pose to his students, which sometimes results in chaos. When Hagrid is absent, his lessons are taken over by Professor Grubbly-Plank, a witch and an acquaintance of Dumbledore's.

Charms is the class that teaches how to develop incantations for the uses of bewitchment. Rowling has described Charms as a type of magic spell concerned with giving an object new and unexpected properties.Charms classes are described as notoriously noisy and chaotic, as the lessons are largely practical.Many of the exposition sequences in the books are set in Charms classes, which are on the second floor of Hogwarts. The class is taught by Professor Flitwick.

Defence Against the Dark Arts, commonly shortened to D.A.D.A., is the class that teaches students defensive techniques to defend against the Dark Arts, and to be protected from Dark creatures.

Divination is the art of predicting the future. Various methods are described, including tea leaves, fire omens, crystal balls, palmistry, cartomancy (including the reading of conventional playing cards and the tarot), astrology, and dream interpretations. Divination is described by Professor McGonagall as "one of the most imprecise branches of magic".Supporters of the subject claim that it is an inexact science that requires innate gifts like the "Inner Eye". Those opposed claim that the subject is irrelevant and fraudulent. Harry is first taught Divination by Professor Trelawney, and then later by Firenze after Trelawney is sacked by Dolores Umbridge in Harry's fifth year. In the sixth (and presumably seventh) year, Firenze and Professor Trelawney teach Divination.

Flying is the class that teaches the use of broomsticks made for the use of flying and is taught only to Hogwarts first years by Rolanda Hooch. The subject is the only one that requires physicality. The only flying lesson depicted in the Harry Potter series is in Harry Potter and the Philosopher's Stone.

Herbology is the study of magical plants and how to take care of, utilise and combat them. There are at least three greenhouses described in the books, holding a variety of magical plants of varying degrees of lethality. Herbology is also the only subject Neville excels in. The epilogue to Deathly Hallows explains that he later replaces Professor Sprout as the Herbology teacher.

History of Magic is the study of magical history. Cuthbert Binns' lessons are depicted as some of the most boring at Hogwarts. They are only lectures, given without pause, about significant events in wizarding history. Topics have included goblin rebellions, giant wars, and the origins of wizarding secrecy. This is the only class at Hogwarts that is taught by a ghost, as the professor never noticed he had died and simply continued teaching as if nothing had changed.

Muggle Studies is a class taught by Charity Burbage which involves the study of the Muggle (non-magical) culture "from a wizarding point of view." The only need for witches and wizards to learn about Muggle ways and means, is to ensure they can blend in with Muggles while needing to do so (for example, at the 1994 Quidditch World Cup). As the class is only mentioned as being taken by Hermione, and for just one year, little is known about its curriculum.
In the opening chapter of the final book, Voldemort murders Professor Charity Burbage because she portrays Muggles in a positive light and is opposed to limiting wizardry to only people of pure-blood origins. For the rest of the academic year covered by Deathly Hallows, the Death Eater Alecto Carrow teaches Muggle Studies. However, her lessons (which are made compulsory) mainly describe Muggles and Muggle-borns as subhuman and worthy of persecution.

Potions is described as the art of creating mixtures with magical effects. It requires the correct mixing and stirring of ingredients at the right times and temperatures. As to the question of whether a Muggle could brew a potion, given the correct magical ingredients, Rowling has said, "Potions seems, on the face of it, to be the most Muggle-friendly subject. But there does come a point in which you need to do more than stir."Snape's lessons are depicted as unhappy, oppressing times set in a gloomy dungeon in the basement of the castle, whilst Slughorn's, who replaces Snape as Potions Master, is shown as more cheerful and even fun at times.

Transfiguration is essentially the art of changing the properties of an object.Transfiguration is a theory-based subject, including topics such as "Switching Spells" (altering only a part of some object, such as giving a human rabbit's ears); Vanishing Spells (causing an object to completely disappear);and Conjuring Spells (creating objects out of thin air).It is possible to change inanimate objects into animate ones and vice versa – Minerva McGonagall, the class's teacher, transfigures her desk into a pig and back in Philosopher's Stone.