Bill Pronzini (born April 13, 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.

He published his first novel, The Stalker, in 1971. However, 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. Over the life of the series, Nameless has gracefully grown and matured as an “everyman” character, aging along with his creator and audience. While the stories involve the usual range of crimes typical to mysteries, they depict relatively little violence. Pronzini’s style is more character driven than plot driven, giving his stories insights, depth, and durability atypical for the mystery field. Because Nameless develops over the run of the series, it's most effective to read them in sequence.

His books have been translated into nearly twenty languages, and have been published in more than thirty countries.

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