Rajeev Ranjan, born on 22 September 1961, is a retired Indian Administrative Service officer from the 1985 Tamil Nadu cadre. He served as Chief Secretary to the Government of Tamil Nadu from 31 January 2021 to 30 September 2021 in the Personnel and Administrative Reforms Department. His educational background includes a B.Sc. (Hons) in Physics from Patna University, an MBA in Management from the Indian Institute of Management Ahmedabad, and a postgraduate degree in Public Policy from the London School of Economics and Political Science. Throughout his career, he held various positions including Secretary, Additional Chief Secretary, Principal Secretary, and District Collector.