Chengam is a state assembly constituency in Tiruvannamalai district in Tamil Nadu, India. Its State Assembly Constituency number is 62. The seat is reserved for candidates from the Scheduled Castes and comprises a portion of Chengam taluk. It is a part of Tiruvannamalai Lok Sabha constituency for national elections to the Parliament of India. It is one of the 234 State Legislative Assembly Constituencies in Tamil Nadu, in India.