Zbigniew Nienacki (January 1, 1929 in Łódź – September 23, 1994 in Morąg) was a pen name of Polish writer, Zbigniew Tomasz Nowicki.
His works consist of adventure stories aimed at teenagers as well as adult novels. He achieved his greatest acclaim for his Pan Samochodzik series, a sequence of historical detective stories centering around a museum employee and his fantastic automobile (samochodzik means a little car in Polish). The works Uwodziciel, Raz w roku w Skiroławkach, Wielki Las, and Dagome Iudex contain erotic themes, especially erotic fantasies, that caused some controversy in Poland, especially Raz w roku w Skirolawkach was strongly criticised by the Communist Poland's media. Series Dagome Iudex is, outside erotica, is an attempt to weave Polish Piast history and Slavic, Norse and folk traditions into the historical adult novel, where main character is every bit like Machiavelli's Prince.
Aside from being forcibly relocated during World War II and his brief studies in cinematography in Moscow, he spent most of his life until 1967 in Łódź. In 1967 he moved to Masuria (Polish: Mazury), a lake filled region in northeastern Poland, where he remained until his death. Mazury are sometimes the setting for Pan Samochodzik and feature in some of his other works.