Vengarai is a panchayat town of Paramathi Velur taluk, Namakkal district in the Indian state of Tamil Nadu.
In the 2001 India census, Vengarai had a population of 13,447. Males constituted 50% of the population and females 50%. Vengarai had an average literacy rate of 66%, higher than the national average of 59.5%: male literacy was 75%, and female literacy 56%. In Vengarai, 9% of the population were under 6 years of age.