Chidambaram is a town and municipality in Cuddalore district in the Indian state of Tamil Nadu, on the banks of the Vellar River where it meets the Bay of Bengal. It is the headquarters of the Chidambaram taluk. The town is believed to be of significant antiquity and has been ruled, at different times, by the Pallavas until ninth century, Medieval Cholas, Later Cholas, Later Pandyas, Vijayanagara Empire, Thanjavur Nayakas, Marathas and the British. The town is known for the Thillai Nataraja Temple and Thillai Kali Temple, and the annual chariot festival held in the months of December–January and June to July. One of the Divya Desams Divya Sri Govindaraja Perumal Temple (Thiruchitrakoodam) is a part of Thillai Nataraja Temple complex. Thiruvetkalam Shiva Temple, Vadakiruppu, Thirunelvayil Shiva Temple, Sivapuri and Tirukkazhippalai Palvannanathar Temple are the other three ancient Shiva temples in the region.

Cuddalore District is one of the 38 districts in the state of Tamil Nadu in India.