Ajai Kumar Singh (born in 1953) is an Indian chemist and Emeritus Professor of Chemistry at IIT Delhi. Singh is known for his contribution to the development of new organochalcogen ligand family and their metal complexes for promoting carbon-carbon coupling and related transformations. Singh is an honorary member of Science Faculty of the University of Delhi.
Ajai was born in New Delhi, India. He completed his master's degree in Inorganic Chemistry at University of Delhi. In 1977 Singh was promoted to Ph.D. at University of Delhi. His thesis advisor was RP Singh.
Singh was a postdoctoral fellow at Aston University with W. R. McWhinnie. In 1982, he joined IIT faculty as an assistant professor of chemistry. He was promoted to associate professor in 1995 and to Professor in 2000. He has coauthored over 200 accepted academic publications. He is known for his involvement in the development of organochalcogen ligand family and their metal complexes for promoting C-C coupling reactions and related transformations. As of 2015, he served as an editorial member for the academic journal, RSC Advances.