List of best-selling books

This page provides lists of best-selling single-volume books and book series to date and in any language. "Best-selling" refers to the estimated number of copies sold of each book, rather than the number of books printed or currently owned. Comics and textbooks are not included in this list. The books are listed according to the highest sales estimate as reported in reliable, independent sources.

Religious books, especially the Bible and the Qur'an, are probably the most-printed books, but it is nearly impossible to find reliable sales figures for them. Print figures are missing or unreliable since these books are produced by many different and unrelated publishers. Furthermore, many copies of the Bible and the Qur'an are printed and given away free, instead of being sold. The same goes for some political books, such as the works of Mao Zedong or Adolf Hitler. Thus it is impossible to determine either the number printed, or the proportion of those printed that are sold. All such books have been excluded from this list for those reasons.