The diocese is a suffragan of the Archdiocese of Cotabato and is currently headed by Bishop Cerilo Uy Casicas on April 29, 2018 by Pope Francis.

[3] It is also where Dole Philippines has over 80 square kilometers of pineapple plantations, and a sister company is involved in the production of Cavendish bananas.

The fishing industry is also extending from the surrounding waters of Sarangani Bay and the Celebes Sea.

[4] The Diocese of Marbel comprises the civil provinces of South Cotabato, Sarangani and some parts of Sultan Kudarat.

The diocesan pastoral offices include the Commissions on Christian Formation, Social Action, Worship and Liturgy.