Rettanai is a village in Tindivanam tehsil in district of Viluppuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Rettanai was 7,816 which includes 3,969 males and 3,847 females. Rettanai covers 1495.91 ha area. Pincode of Rettanai is 604306.