Chengannur is a municipality and Town in Alappuzha district, Kerala, India. It is also the headquarters of the Chengannur Taluk. Chengannur is located in the south-eastern part of the district, in the region known as Odanad, along the banks of Pamba River. Chengannur is 36 kilometres (22 mi) southeast of the district headquarters Alappuzha and 117 kilometres (73 mi) north of the state capital Thiruvananthapuram. Both the NH 183 and Main Central Road pass through the town.

Alappuzha district, is one of the 14 districts in the Indian state of Kerala. It was formed as Alleppey district on 17 August 1957, the name of the district being changed to Alappuzha in 1990. Alappuzha is the smallest district of Kerala. Alleppey town, the district headquarters, was renamed Alappuzha in 2012, even though the anglicised name is still commonly used to describe the town as well as the district.