Jurisdiction | Cathedral | Type |
| Aitape | St. Ignatius Cathedral  Aitape, West Sepik, Papua New Guinea  |  Cathedral |
| Alotau–Sideia | Cathedral of the Sacred Heart of Jesus Alotau, Milne Bay, Papua New Guinea | Cathedral |
| Bereina | Our Lady of the Sacred Heart Cathedral Bereina, Central, Papua New Guinea | Cathedral |
| Bougainville | Our Lady of the Assumption Cathedral Buka, Bougainville, Papua New Guinea | Cathedral |
| Bougainville | Church of St. Michael the Archangel Tubiana, Bougainville, Papua New Guinea |  Former Cathedral |
| Daru–Kiunga | St. Gerard’s Cathedral Kiunga, Western, Papua New Guinea | Cathedral |
| Daru–Kiunga | St. Louis de Montfort Co-Cathedral Daru, Western, Papua New Guinea |  Co-Cathedral |
| Goroka | Mary Help of Christians Cathedral Goroka, Eastern Highlands, Papua New Guinea | Cathedral |
| Kavieng | Our Lady of the Sacred Heart Cathedral Kavieng, New Ireland, Papua New Guinea | Cathedral |
| Kerema | Holy Spirit Cathedral Kerema, Gulf, Papua New Guinea | Cathedral |
| Kimbe | Cathedral of Sts. Peter and Paul Kimbe, West New Britain, Papua New Guinea | Cathedral |
| Kundiawa | Mary Help of Christians Cathedral Kundiawa, Chimbu, Papua New Guinea | Cathedral |
| Lae | St Mary’s Cathedral Lae, Morobe, Papua New Guinea | Cathedral |
| Madang | Holy Spirit Cathedral Madang, Madang, Papua New Guinea | Cathedral |
| Mendi | Mother of the Divine Shepherd Cathedral Mendi, Southern Highlands, Papua New Guinea | Cathedral |
| Mount Hagen | Holy Trinity Cathedral Mount Hagen, Western Highlands, Papua New Guinea | Cathedral |
| Port Moresby | St. Mary’s Cathedral Port Moresby, National Capital District, Papua New Guinea | Cathedral |
| Rabaul | Sacred Heart Cathedral Vunapope, East New Britain, Papua New Guinea | Cathedral |
| Rabaul | St Francis Xavier’s Co-Cathedral Rabaul, East New Britain, Papua New Guinea | Co-Cathedral |
| Vanimo | Holy Cross Pro-Cathedral Vanimo, West Sepik, Papua New Guinea |  Pro-Cathedral |
| Wabag | Good Shepherd Cathedral Sangurap, Enga, Papua New Guinea | Cathedral |
| Wewak | Christ the King Cathedral Wewak, East Sepik, Papua New Guinea | Cathedral |
