Vridhachalam is a legislative assembly constituency in Cuddalore district in the Indian state of Tamil Nadu. Before 2009, it was part of the Chidambaram (Lok Sabha constituency). After 2009, it is part of Cuddalore (Lok Sabha constituency). This constituent was won by popular actor Vijaykanth, during the 2006 Assembly election, under his new party Desiya Murpokku Dravida Kazhagam.