Cheyyaru or 'Cheyyar' is a state assembly constituency in Tiruvannamalai district of Tamil Nadu, India. Its State Assembly Constituency number is 68. It comprises a portion of Cheyyar taluk and Vembakkam taluk and is a part of Arani 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.