Stanley Falkow, PhD, (24 January, 1934 – 5 May, 2018) was an American microbiologist and a professor of microbiology and immunology at Stanford University School of Medicine. He was known for his study of how infectious microbes and host cells interact to cause disease at the molecular level. He created molecular Koch's postulates, which have guided the study of the microbial determinants of infectious diseases since the late 1980s.