Helge Stjernholm Kragh is a Danish historian of science. Kragh studied mathematics and physics at the University of Copenhagen before obtaining his PhD in 1981 at the University of Roskilde. He is a professor at the Centre for Science Studies of Aarhus University. Kragh's areas of study are the history of physics from the mid-19th century onward, the history of astronomy, the history of cosmology and the history of chemistry.