Which character is the headmaster of Hogwarts when Harry Potter first arrives at the school?

Albus Dumbledore is the headmaster of Hogwarts when Harry Potter first arrives at the school.

Dumbledore leads Hogwarts during the events of Harry Potter and the Philosopher’s Stone. He is one of the most powerful and respected wizards in the series, known for his intelligence, calm authority, and opposition to Lord Voldemort. Richard Harris played him in the first two films, while Michael Gambon portrayed him in the remaining six.

Minerva McGonagall is the deputy headmistress and Transfiguration professor during Harry’s early years, which can cause confusion about the school’s leadership. Severus Snape teaches Potions before later becoming headmaster under different circumstances.

Dumbledore’s history with Voldemort and his earlier defeat of the dark wizard Grindelwald become increasingly important as the series progresses. His role is both Hogwarts leader and mentor to Harry.