Peter Weish (* 29 November 1936 in Vienna) is an Austrian scientist (biology, chemistry and physics), author and environmental activist. Peter Weish studied biology, chemistry and physics at the University of Vienna. After receiving his doctorate of philosophy in 1966 he worked at the Institute for Nuclear Radiation Protection Centre Seibersdorf until 1970. In 1969 he began a critical engagement with the health and societal aspects of nuclear energy. From 1974 he worked as a research officer at the Institute of Environmental Sciences and Conservation.