The Roman Catholic Diocese of Gizo is a suffragan diocese of the Roman Catholic Archdiocese of Honiara. It was erected Vicariate Apostolic in 1959 from the Vicariates Apostolic of Northern Solomon Islands and Southern Solomon Islands. In 1966, it was elevated to a diocese and was renamed as the Diocese of Gizo. St. Peter's Cathedral at Gizo is the mother church for the diocese.

• Eusebius John Crawford, O.P. (1960–1995)
• Bernard Cyril O'Grady, O.P. (1995–2007)
• Luciano Capelli, S.D.B. (2007-2023)
• Peter Houhou (2023- )

• Christopher Michael Cardone, O.P. (2001-2004), appointed Bishop of Auki

• "Diocese of Gizo". Catholic-Hierarchy. Retrieved 2007-01-10.

8°06′17″S 156°50′38″E / 8.1046°S 156.8440°E / -8.1046; 156.8440