Peet Kask (born 21 February 1948) is an Estonian physicist, political scientist and former politician, most notable for voting for the Estonian restoration of Independence. Kask graduated from the University of Tartu in 1971 with a degree in physics. He defended his dissertation in 1975. He studied politics at Columbia University from 1993 to 1994. He worked at the National Institute of Chemical Physics and Biophysics from its creation until 1990. His field of research is fluorescence-based detection techniques for molecules. He is one of the largest owners of patents in Estonia.