Sonai (Pron:/'sə(ʊ)'nʌɪ) is a town in the Cachar district in the Indian state of Assam. It is also the name of a circle and block in the town. Government of Assam declared it as a municipal area on 2016 with 11 wards. The River Sonai flows through the town of Sonai joining with Barak River near Dungripar Village of Sonai. The Chandragiri Park and an Archeological site, a temple of Kachari Kingdom at Shivtilla (Changutilla) near Madhab Chandra Das College (MCD College) is a famous place to visit.

It is located 18.5 km from District Headquarters Silchar.

Bengali and Meitei (Manipuri) are the official languages of this place.

As per the 2011 census of India, Sonai had a total population of 324,315, of which 51% were male and 49% were female. Sonai has an average literacy rate of 80%, with a male literacy rate of 54% and female literacy rate of 46%.

There is one Revenue Circle containing 203 Revenue Villages and three Development Blocks: Sonai Development Block, Narsingpur Development Block and Palonghat Development Block.

The institution of Barak Valley like National Institute of Technology, Silchar, Assam University, Silchar Campus, and Silchar Medical College and Hospital falls under Sonai (Vidhan Sabha constituency).

Government/Provisionalised Schools

Private Schools