The Roman Catholic Diocese of Alotau-Sideia is a Latin suffragan diocese in the ecclesiastical province of the Metropolitan Roman Catholic Archdiocese of Port Moresby, yet remains dependent on the Roman Congregation for the Missions Propaganda Fide.

Its cathedral episcopal see is the Cathedral of the Sacred Heart of Jesus, in Alotau, Milne Bay Province.

(all Roman Rite, so far missionary members of Latin congregations)

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