The (Henryka Niewodniczański) Institute of Nuclear Physics Polish Academy of Sciences is a research center in the field of nuclear physics of the Polish Academy of Sciences, located in Kraków. It was founded in 1955 by Henryk Niewodniczański. In 1988 the institute was named after Niewodniczański. The co-founder of the Institute was Marian Mięsowicz. The institute conducts research in four main areas: