Prof. Gautam R. Desiraju (born 21 August 1952) is an Indian structural chemist and Honorary Professor at the Indian Institute of Science, Bengaluru. A pioneer of crystal engineering, he helped establish the importance of weak hydrogen bonds and introduced the “supramolecular synthon” concept.He served as President of the International Union of Crystallography (2011–2014). Educated at St. Xavier’s College (University of Bombay) and the University of Illinois at Urbana–Champaign (PhD, 1976), he has authored/edited several influential books.He remains one of India’s most cited chemists and a leading voice on the future of chemistry and science in the country.