Which fictional school subject does Remus Lupin teach in J.K. Rowling’s Harry Potter and the Prisoner of Azkaban?

Remus Lupin teaches Defence Against the Dark Arts in J.K. Rowling’s Harry Potter and the Prisoner of Azkaban.

Lupin is appointed the subject’s Hogwarts teacher during Harry’s third year. He proves to be one of the school’s most effective instructors, giving students practical lessons against dark creatures. His classroom teaching includes the Boggart lesson, in which students learn to use the Riddikulus spell.

Lupin is also a werewolf, a fact that becomes central to the novel’s plot and to the prejudice he experiences. His condition explains why he leaves Hogwarts at the end of the school year after his identity is exposed to parents and school authorities.

Defence Against the Dark Arts is not the same as Dark Arts. The former is a protective subject taught at Hogwarts, while the latter refers to harmful or forbidden magic. The position’s history is also notable: no teacher is known to have held it for more than one year during Harry’s school career.