The Roman Catholic Diocese of Morón (erected 11 February 1957) is in Argentina and is a suffragan of the Archdiocese of Buenos Aires.
| Year | Along with | To form |
|---|---|---|
| 1961 | Diocese of San Isidro | Diocese of San Martín |
| 1969 | Diocese of Lomas de Zamora | Diocese of San Justo |
| 1997 | Diocese of Merlo-Moreno | |
| 2010 | Diocese of Buno el Doro |