D. Rajarathinam was an Indian politician and former Member of the Legislative Assembly of Tamil Nadu. He was elected to the Tamil Nadu legislative assembly from Sriperumbudur constituency as a Dravida Munnetra Kazhagam candidate in 1967, and 1971 elections. He was elected from Poonamallee constituency as a Dravida Munnetra Kazhagam candidate in 1977, and 1980 elections.