Ēḻarappaḷḷikaḷ or Ezharappallikal, are the seven major churches or Christian communities of Saint Thomas Christians across Malabar Coast of India that are believed to have been founded by Thomas the Apostle in the first century. According to Indian Christian traditions, the apostle Thomas arrived in Muziris (Kodungallur) in AD 52, established the Ezharappallikal and evangelised in present-day Kerala and Tamil Nadu. Many of these churches built near Jewish and Brahmin settlements. These were at Maliankara (Kodungallur), Kollam, Palayoor, Kottakkayal, Kokkamangalam, Niranam and Nilackal (Chayal). Thiruvithamcode church in Kanyakumari was built on the land given by arachan (king) and hence it is often referred in the name Arappally. Similarly, the Churches at Malayattoor and Aruvithura are also referred to as Arappallikal.

The Saint Thomas Christians, also called Syrian Christians of India, Marthoma Suriyani Nasrani, Malankara Nasrani, or Nasrani Mappila, are an ethno-religious community of Indian Christians in the state of Kerala, who, for the most part, employ the Eastern and Western liturgical rites of Syriac Christianity. They trace their origins to the evangelistic activity of Thomas the Apostle in the 1st century. The Saint Thomas Christians had been historically a part of the hierarchy of the Church of the East but are now divided into several different Eastern Catholic, Oriental Orthodox, Protestant, and independent bodies, each with their own liturgies and traditions. They are Malayalis and their mother tongue is Malayalam, which is a Dravidian language. Nasrani or Nazarene is a Syriac term for Christians, who were among the first converts to Christianity in the Near East.