The Archeparchy of Changanacherry is a Syro-Malabar Catholic archeparchy with an area of 24,595 km2 comprising the districts of Kottayam, Alappuzha, Pathanamthitta, Kollam, and Thiruvananthapuram in Kerala, and also Kanyakumari district in Tamil Nadu. It is one of the largest Catholic dioceses in India in terms of area. Joseph Perumthottam is the current Metropolitan Archbishop, serving since 2007. Thomas Tharayil has been the auxiliary bishop since 2017. Suffragan eparchies of the Changanassery archeparchy includes Palai, Kanjirappally-Nilackal, and Thuckalay-Thiruvithancode.

The Syro-Malabar Church, also known as the Syro-Malabar Catholic Church, is an Eastern Catholic Church based in Kerala, India. It is a sui iuris (autonomous) particular church in full communion with the Holy See and the worldwide Catholic Church, with self-governance under the Code of Canons of the Eastern Churches (CCEO). The major archbishop presides over the entire church. The incumbent Major Archbishop is Raphael Thattil, serving since January 2024. The Syro-Malabar Synod of Bishops canonically convoked and presided over by the major archbishop constitutes the supreme authority of the church. The Major Archiepiscopal Curia of the church is based in Kakkanad, Kochi. Syro-Malabar is a prefix reflecting the church's use of the East Syriac Rite liturgy and origins in Malabar. The name has been in usage in official Vatican documents since the nineteenth century.