The Diocese of Đà Lat is a Latin suffragan diocese of Roman Catholic church in the ecclesiastical province of the Metropolitan of the Archdiocese of Ho Chi Minh City in southern Vietnam, yet depends on the missionary Dicastery for Evangelization.

The Metropolitan Archdiocese of Saigon or Archidioecesis Hochiminhopolitana is a Roman Catholic ecclesiastical territory in the south of Vietnam. By far the largest diocese in the country by population of people and second in the number of Catholics, yet like most big cities it only covers a small area of 2,390 km2 (920 sq mi).