Stefan von Bogdándy (Hungarian: Bogdándy István) (* 11 September 1890 in Kolozsvár, Hungary, † 4 August 1933 in Berlin, Germany[1]) was a Hungarian physician and physical chemist.
[2] He was born in Kolozsvár, Hungary (now Cluj-Napoca, Romania), to a noble Hungarian, Roman Catholic family.
[3] He studied medicine in Kolozsvár, and worked as a teaching assistant at the Physiological Institute of the University of Budapest early in his career.
He moved to Berlin in the 1920s to work for Fritz Haber at the Kaiser Wilhelm Institute for Physical Chemistry and Electrochemistry.
Together with Polanyi, he "developed the highly-dilute flame techniques pioneered by the Haber and Zisch into a powerful tool for studying simple reaction rates through chemiluminescence.