The Metropolitan Archdiocese of Trivandrum is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church. Its episcopal see is Thiruvananthapuram in Kerala, India. It shares its see with the major archeparchy of the Syro-Malankara Catholic Church, the Major Archeparchy of Trivandrum. The archdiocese a metropolitan see of an ecclesiastical province with four suffragan dioceses.

The Diocese of Quilon is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church based in the southern Indian city of Kollam. It is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Trivandrum. The Diocese of Quilon covers an area of 1,950 km2 that contains a population of some 4.8 million. At least 4.8% of the people in the area are Catholic.