S Nagarajan, born on 08/02/1979, is an Indian Administrative Service officer from the 2005 batch, Tamil Nadu cadre. He holds a B.E. degree from BITS Pilani. Currently, he serves as the Commissioner at Tamil Nadu's Commercial Taxes Department since 24/06/2025. Throughout his career, he has held various positions including Assistant Collector, District Collector, Deputy Secretary, Project Officer, Director, Additional Director, Additional Secretary, Commissioner Director, and Project Director. He is proficient in English and Hindi. Mr. Nagarajan continues to serve in the IAS with a focus on administrative roles within Tamil Nadu.