Its cathedral episcopal see is St. Theresa’s Cathedral, in Saga(u)r. The future eparchy (diocese) of Sagar was erected as an apostolic exarchate (pre-diocesan missionary Eastern Catholic jurisdiction) by the papal bull Quo Aptius dated 29 July 1968, cutting out previously Latin rite territory from the Archdiocese of Bhopal the civil districts of Sagar, Raisen and Vidisha in Madhya Pradesh state.

Again at the request of the Bishop of Ajmer-Jaipur, the district of Guna was added to the Exarchate of Sagar by the papal decree De Bono Animarum on 2 April 1973.

Eighty per cent of the people are Hindus belonging to various castes and the rest are Muslims, Jains, Sikhs, Adivasis and a very small minority of Christians.

The various Socio-Pastoral, Medical and Educational apostolates of the Church are being carried out in the eparchy under the Sagar Diocesan Service Society (SDSS), which is registered under the M.P.

For better coordination and management, the social work apostolate of the diocese is being carried out by Manav Vikas Seva Sangh (MVSS).