The Poona Diocese consists of the civil districts of Pune, Satara, Solapur, Sangli & Kolhapur city.

The Vicar Apostolic of Bombay remained Administrator till the Hierarchy was established in 1886.

On October 20, 1953, the Catholics of Ratnagiri District and those of the Church of the Immaculate Conception, Pune, who formerly belonged to the Archdiocese of Goa, were placed under the jurisdiction of the Bishop of Poona.

The Eparchy of Kalyan, which is contiguous with the Archdiocese of Bombay and the Dioceses of Poona and Nashik, was created on May 19, 1988.

On August 24, 1988, Paul Chittilapilly was ordained Eparch of Kalyan, and the new diocese was formally inaugurated.