Bill Pronzini (b. 1943) is an American writer of detective fiction. He is also an active anthologist, having compiled more than 100 collections, most of which focus on mystery, western, and science fiction short stories. His best known works are the Nameless Detective series, which he began in 1971. As of April, 2009, there are more than 35 books in the series, as well as a number of short stories. His books have been translated into nearly twenty languages, and have been published in more than thirty countries.