Albus Dumbledore (played by Richard Harris and later by Michael Gambon)
The longtime headmaster of Hogwarts, Dumbledore is known as the most powerful wizard of his time. He's easily recognizable by his long, silver hair and beard.
Dumbledore is one of Harry's biggest supporters—he was the one who sent young Harry to his Muggle aunt for protection after his parents' deaths. The wizard also formed the Order of Phoenix, a secret society of allies dedicated to defeating the Dark Lord and protecting Harry.
Photo: Warner Bros.