Alexandra Navrotsky (born 20 June 1943 in New York City) is a physical chemist in the field of nanogeoscience. She is an elected member of the United States National Academy of Sciences (NAS) and the American Philosophical Society (APS). She was a board member of the Earth Sciences and Resources division of the NAS from 1995 until 2000.In 2005, she was awarded the Urey Medal, by the European Association of Geochemistry.In 2006, she was awarded the Harry H. Hess Medal, by the American Geophysical Union.She is currently the director of NEAT ORU (Nanomaterials in Environment, Agriculture, and Technology Organized Research Unit), a primary program in nanogeoscience. She is Distinguished Professor at University of California, Davis.