The 21 Best-selling Books of All Time

Harry Potter and the Deathly Hallows – 50 million

The final, mammoth volume in the Harry Potter series was released in 2007 and had sold 44 million copies just one year later -- and that's before the paperback version had even come out. It has certainly passed the 50 million mark at this point.

There are several other books that are reported to have sold in the neighborhood of 50 million copies, including "The Common Sense Book of Baby and Childcare" by Dr. Benjamin Spock, and Alpine classic "Heidi's Years of Wandering and Learning" by Johanna Spyri.

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