B. Ranganathan is an Indian politician and has been a Member of the Legislative Assembly of Tamil Nadu. He was elected to the Tamil Nadu legislative assembly from Purasawalkam constituency as an Indian National Congress candidate in the 1991[1] and 1996 elections.[2] He was elected as a Dravida Munnetra Kazhagam candidate in 2001 election.[3] In 2006 election he was elected as M.L.A. for Villivakkam constituency. He was re-elected to Villivakkam constituency in 2016. He was a staunch opponent of AIADMK and their policies. He is very active in Kolathur ex-Purasai area and lives in Jawahar Nagar near Perambur. B. Ranganathan has a reputation for field work and his fights with the opponents in and outside the assembly. He was once a confidant of P. Chidambaram when in Congress but moved to DMK after Mr Chidambaram merged his Peravai with Congress.