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According to Guinness World Records as of 1995, the Bible is the best selling book yet written with an estimated 5 billion copies sold and distributed. Sales estimates for other printed religious texts include at least 800 million copies for the Qur'an and 190 million copies for the Book of Mormon.
Among non-religious texts, the Quotations from Chairman Mao Tse-tung, also known as the Little Red Book, has produced a wide array of sales and distribution figures—with estimates ranging from 800 million to over 6.5 billion printed volumes.
Harry Potter and the Philosopher's Stone has sold in excess of 120 million copies, making it one of the best-selling books of all time
Yet even on Wikipedia’s list, that Harry Potter volume is only third place after A Tale of Two Cities by Charles Dickens and The Little Prince by Antoine de Saint-Exupéry.