Professor Harkishan Singh (25 November 1928 – 20 March 2020) was an Indian chemist. He was a Professor Emeritus at the Panjab University. He was a well known pharmaceutical academic, medicinal chemistry researcher and science historian. He had worked at the Banaras Hindu University, University of Saugar, and the Panjab University in India, and abroad at the University of Maryland, University of Mississippi and the University of London.