Giuseppina "Pepi" Fabbiano is an American astrophysicist. She works as senior astrophysics in the High Energy Astrophysics Division, at the Smithsonian Astrophysical Observatory. She has chaired the executive committee of the International Virtual Observatory Alliance. Fabbiano was elected a fellow of the AAAS (American Association for the Advancement of Science) in 2011 for her contribution to astronomy. In 2021 Fabbiano co-authored a paper that suggests that quasars can be used as a standard candle to determine cosmological distances at high redshifts.
She was born in Palermo, Italy. She earned the Ph.D. of physics from the University of Palermo in 1973. She studies black holes, cosmology and x-ray emission of galaxies.
She was raised in a family of teachers and professors. In high school she won a math prize to visit France.
See also the list of Pepi Fabbiano's publications.