It's hard to believe but boy wizard Harry Potter would be turning 30 if he was real.
According to the books, the Hogwarts pupil was born on 31 July 1980. He has the same birthdate as author JK Rowling - but not the same year obviously!
Birthday celebrations are also taking place for Daniel Radcliffe, who plays Harry in the films as he's turned 21.
Loads of fans are going along to the new Potter theme park in America to mark Harry's birthday.
Maybe they'll be celebrating with a few of Hagrid's rock cakes and some chocolate frogs!
Tales of Harry's adventures have been thrilling kids for decades now.
The first book, Harry Potter and the Philosopher's Stone, was out in 1997.
Now fans are waiting for the last two films to hit the big screen.
Harry Potter and the Deathly Hallows part 1 is due out in November, with the second part out in 2011.
Both films are going to be 3D so even muggles will be able to enjoy some real-life magic!
Watch Harry Potter and the Deathly Hallows trailer HERE