Mar Thomas Tharayil( born 2 February 1972) is the auxiliary bishop of Syro-Malabar Archeparchy of Changanacherry. He was conferred as the auxiliary bishop by Mar Joseph Perumthottam on 23 April 2017.

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.