Professor Quirinus Quirrell, or simply known as Professor Quirrell, is the main antagonist of the 1998 novel Harry Potter and the Philosopher's Stone sand the 2001 film adaptation of the same name. .
He was a half-blood wizard who became the Defense Against the Dark Arts teacher during Harry Potter's first year at Hogwarts. He was the host of Lord Voldemort's non-corporal form and planned to steal the Philosopher's Stone and use it to give Voldemort a new physical body.