P B Sidharthan, born on January 20, 1949, is a retired Indian Administrative Service officer from the 1993 Kerala cadre. A graduate by education, he served in various capacities including Managing Director, Director, Additional Commissioner, Deputy Secretary, District Collector, Registrar, and Sub Collector. He held the position of Secretary from March 15, 2008, to January 31, 2009. His most recent role was Director of Census Operations in the Land Revenue Department. Throughout his career, he contributed to multiple administrative functions within the Kerala cadre before retiring from service.