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.