Dr. C. K. Gandhirajan is an Indian Police Service (IPS) Officer of the 1985 batch belonging to the Tamil Nadu cadre. Hailing from Thiruvallur District, he serves as the Director General of Police,Fire, Rescue and Emergency Services in Tamil Nadu. He obtained a PhD. in criminology from the University of Madras. He is the author of two books, Organized Crime and Inside Prisons.