This is a list of best-selling fiction authors to date, in any language. While finding precise sales numbers for any given author is nearly impossible, the list is based on approximate numbers provided or repeated by reliable sources. Numbers given are estimated copies sold of all fiction books written or co-written by an author. To keep the list manageable, only authors with estimated sales of at least 100 million are included. Authors of comic books are not included unless they have been published in book format.