St. Mary's Cathedral is one of the oldest church of the Ranchi, in the Chota Nagpur Plateau area.

Christian Missionaries serving among the people made thatched sheds on the hillock near the market and Kallada River.

During the Second World War the First Fathers had to go back, entrusting the church work to the diocesan clergy of Quilon (Kollam).

Ranchi Diocese was separated from the Diocese of Quilon (Kollam) and created into a separate unit by the Bull “Verba Christ” of Pope John Paul II, issued on 21 December 1985.

St Mary's Cathedral complex is located on north of Ranchi railway on Dr caumil Bulke path (Purulia Road).