The Roman Catholic Diocese of Mar del Plata (Latin: Dioecesis Maris Platensis) is in Argentina and is a suffragan of the Archdiocese of La Plata.

On 11 February 1957, Pope Pius XII established the Diocese of Mar del Plata from the Diocese of Bahía Blanca and the Archdiocese of La Plata.

Territory was taken from the diocese in 1980 to form the Diocese of Chascomús.

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