Chengannur is a municipal town in the Alappuzha district of the state of Kerala in South India. Chengannur is located in the extreme eastern part of Alappuzha district, on the banks of Pamba River. It is 117 kilometres (73 mi) north of the state capital Thiruvananthapuram on the MC Road. Chengannur is connected to Kollam and Kottayam by NH 220. Chengannur is noted for Chengannur mahadeva Temple and its Old Syrian Church. Chengannur is also a major destination of Sabarimala pilgrims known as the Gateway of Sabarimala.

The nearby municipal towns are Pandalam and  Adoor to the south,  Mavelikkara to the west,  Aranmula,  Kozhenchery and Pathanamthitta to the east and  Thiruvalla to the north. The taluk comprises villages such as Kurattissery, Mannar. Ennakkad,  Pandanad,  Thiruvanvandoor, Chengannur, Mulakkuzha , Budhanur and Venmony

According to the 2011 census, Chengannur has a literacy rate of 96.26% (males: 97.90%, females: 94.80%). Chengannur has a sex ratio of 1100. The total increase in the population from 2001 has been estimated as 0.61%. Its population is predominantly Hindu and Christian, with a very small number of Muslims. The most widely spoken language is Malayalam. The standard dialect of Malayalam spoken is the Central Travancore dialect

Chengannur Municipality has total administration over 6,278 houses to which it supplies basic amenities like water and sewerage.