The Thoothukudi - Nazareth Diocese is a diocese of Church of South India in Tamil Nadu state of India.The diocese is one among the 22 dioceses of Church of South India, a United Protestant denomination.The cathedral of the diocese is St. John's Cathedral at Nazareth, Tamil Nadu.

Thoothukudi - Nazareth Diocese was bifurcated from Tirunelveli diocese and its formed on 25 October 2003 bifurcating areas from Tirunelveli Diocese.

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