Life member of National Sports Club of India, Bombay.
Member of the National Society for the prevention of blindness, India, Bombay branch.
Life member of Bombay Management Association.
Life member of Nellai Saiva Vellalar Sangam, Bombay.
Life member of Rajpath Club Ltd., Ahmedabad.
Life member of Citibank, Diners Club.
Dr. S. Natarajan become a Patron and Life Member of "Bombay Tamil Sangham" Sion Road, Bombay - 400 022.
Dr. S. Natarajan become Life Member of Bharatiya Vidya Bhavan, Bombay.
Young Men Christian Association (Y.M.C.A).
He has been selected as one of the three finalists in the category of Scientific & Technological Development of the Outstanding Young Persons of the World Program by Junior Chamber International, U.S.A.