Which Hogwarts subject does Remus Lupin teach in J.K. Rowling’s Harry Potter series?

Remus Lupin teaches Defence Against the Dark Arts in J.K. Rowling’s Harry Potter series.

Lupin becomes the Defence Against the Dark Arts teacher during Harry’s third year at Hogwarts, in Harry Potter and the Prisoner of Azkaban. He is widely regarded by Harry and his classmates as one of the subject’s most effective teachers.

His lessons include practical encounters with magical threats, including a boggart exercise and instruction about defensive creatures. Lupin’s calm teaching style contrasts with the instability associated with many other teachers of the subject.

Lupin’s tenure ends after his werewolf identity is revealed. The school’s headmaster, Albus Dumbledore, had appointed him despite that condition, but Lupin resigns to prevent public pressure from damaging Hogwarts. The subject is often called Defence Against the Dark Arts in British editions; American editions use the spelling Defense.