The Roman Catholic Diocese of Surabaya (Indonesian: Keuskupan Surabaya) (Latin: Dioecesis Surabayana) is a suffragan Latin diocese, located on Java island, in Indonesia and administers parishes in the northern and western parts of East Java province.

Its episcopal see is at the Cathedral of the Sacred Heart of Jesus in Surabaya.

The diocese is headed by bishop-elect Agustinus Tri Budi Utomo,[1][2] who the bishop, Mgr.

Vincentius Sutikno Wisaksono, preceded.