The Syro-Malabar Catholic Church (Aramaic: ܥܹܕܬܵܐ ܕܡܲܠܲܒܵܪ ܣܘܼܪܝܵܝܵܐ, Edtha d'Malabar Suryaya) or Church of Malabar Syrians is an Eastern Catholic Major Archiepiscopal Church in full communion with the Bishop of Rome, the Pope. It is one of the 23 sui iuris Eastern Catholic Churches in the Catholic communion. The Church is headed by Major Archbishop Cardinal George Alencherry of the Archeparchy of Ernakulam-Angamaly in Kerala, India. The members of the Church are known as Mar Thoma Nasranis or Syrian Catholics. It is the largest of the Nasrani denominations with around 4.6 million believers and traces its origins to the evangelistic activity of Thomas the Apostle in the 1st century.
The Syro-Malabar Church follows the East Syrian Rite liturgy, traditionally attributed to saints Addai and Mari, which dates back to 3rd century Edessa, and like the Chaldean Rite is a Syro-Oriental Rite. It is the second largest Eastern Catholic Church, the largest being the Ukrainian Catholic Church. It is one of the two Eastern Catholic Churches from India, the other being the Syro-Malankara Catholic Church which follows the West Syrian Rite liturgy. Saint Alphonsa is the first canonized saint from the Church.