Roman Stanisław Ingarden (1 October 1920 in Zakopane – 12 July 2011 in Kraków) was a Polish physicist, specialised mainly in optics and statistical mechanics, son of the Polish philosopher Roman Witold Ingarden. In 1938 he began his physics studies at the Jan Kazimierz University in Lwów as student of professors Juliusz Schauder, Stefan Banach and Hugo Steinhaus (mathematics) and Stanisław Loria and Wojciech Rubinowicz (physics). 1949 he obtained his doctor’s degree at the University of Warsaw as a pupil of professor Wojciech Rubinowicz.