The S. Rm. family is an Indian family of businessmen, industrialists and bankers from the town of Kanadukathan in the Sivaganga district of Tamil Nadu, India. The family is named after its ancestor, the popular 19th century Nagarathar banker S. Rm. Muthiah Chettiar. The head of the family holds the honorific title Raja of Chettinad. The M. Ct. family has descended from one branch of the S. Rm. family.
Annamalai Chettiar is the maternal grandfather of India's former finance minister P. Chidambaram.