| [[#Quirinus Quirrell|Quirinus Quirrell]]
| [[Defence Against the Dark Arts]]
| The Defence Against the Dark Arts teacher in ''[[Harry Potter and the Philosopher's Stone]]'' (Harry's first year at Hogwarts). He later on turns out to being possessed by Voldemort and is dead by the end of the book.
| Aurora Sinistra
| [[Magic in Harry Potter#Astronomy|Astronomy]]
| The Astronomy teacher during the entire series. Sinistra assists Professor Flitwick in moving a petrified [[Justin Finch-Fletchley]] to the hospital wing in ''Chamber of Secrets''. She attends the Yule Ball in Harry's fourth year with the fake Mad-Eye Moody.
| [[#Horace Slughorn|Horace Slughorn]]
| [[Magic in Harry Potter#Potions|Potions]]
| The Potions master during ''Half-Blood Prince'' and ''Deathly Hallows''. Head of Slytherin House in ''Deathly Hallows''. Slughorn had served as Potions master and Head of Slytherin during various decades prior to Harry's birth, including Tom Riddle's time at Hogwarts.
| [[Severus Snape]]
| [[Potions]] / [[Headmaster]] / [[Defence Against the Dark Arts]]
| The Potions master from Harry's first to fifth years. Head of Slytherin House from Harry's first to sixth years. The Defence Against the Dark Arts teacher in ''[[Harry Potter and the Half-Blood Prince]]'' (Harry's sixth year at Hogwarts). Snape serves as Headmaster in ''[[Harry Potter and the Deathly Hallows]]'', having been appointed by the Minister for Magic, Pius Thicknesse (who was controlled by Voldemort) until he is killed by Voldemort in the final chapters of the novel.
| [[#Pomona Sprout|Pomona Sprout]]