The 21 Best-selling Books of All Time


Harry Potter and the Order of the Phoenix – 55 million

Harry Potter book number five (2003) introduces a secret society dedicated to resisting Voldemort's growing power. Whether this book, "Goblet of Fire," or "Prisoner of Azkaban" has sold more total copies is anyone's guess, and is immaterial in any case. All of the royalties went toward making J.K. Rowling one of the richest women in the world, with a net worth estimated at $1 billion.