The Roman Catholic Diocese of Río Gallegos is located in the city of Río Gallegos, which is the capital of the Patagonia region of Santa Cruz, Argentina.

The Diocese, according to the Vatican Information Service (VIS), has an area of 265,614 square miles, a total population of 300,000, a Catholic population of 210,000, 55 priests, 9 permanent deacons, and 94 religious.

It was erected in 1961, and was formed from the Diocese of Comodoro Rivadavia, Argentina.

It is a suffragan see of the Archdiocese of Bahia Blanca, Argentina.

This article on a Roman Catholic diocese in Argentina is a stub.