But of course, films involve auditions, so there are plenty of stars who missed out on some of the series’ iconic roles. Some, very narrowly.
Here are five of the huge names who didn’t quite make it to the Hogwarts party.
Robin Williams as Hagrid
Images: Getty and Warner Bros.
Robin Williams could make any film shine. But in this case for him, it just wasn't meant to be.
It was revealed by the films' casting director this week that the beloved actor, who died in August 2014, was initially Warner Bros' first choice to play Hagrid.
He lost out to Scot Robbie Coltrane after JK Rowling insisted that all her characters were played by UK actors.