Regions of Papua New Guinea
- Oligukaufo
- Oligadu
- Oliem Creek
- Olialavigu
- Oliabai River
- Ole Creek
- Olea
- Old Yunzain
- Old Wawat 2
- Old Waris
- Old Somaidemasuk
- Old Simog
- Old Setavi
- Old Rigo Road
- Old Pisa
- Old Pendesi
- Old Paw Paw
- Old Okavai
- Old Musu
- Old Massava Plantation
- Old Maria
- Old Kukodobi
- Old Kiava
- Old Kamberatoro
- Old Kamau’a
- Old Kamasau
- Old Inaroo
- Old Imbrinis
- Old Ibagum
- Old Iafar 3
- Old Griengas
- Old Goiniri
- Old Fugumui
- Old Fongwinam
- Cape Oldekobe
- Old Einokneri
- Old Dimiri
- Old Buna
- Old Bovakaka
- Old Berebei
- Old Bangalum
- Old Bakumbari
- Old Akimari
- Old Ainbai
- Ol Creek
- Olaipun
- Okur River
- Okur
- Okupukopu Creek
- Oktidetau
- Oktambip
- Oksapmin Patrol Post
- Okoru Island
- Okomo
- Okimpuna
- Okidetau
- Okentenu
- Okeia Point
- Okawabero River
- Okavai
- Okaukana
- Okasa Government Rest House
- Okapa
- Okapa
- Okana Government Rest House
- Oiyana Government Rest House
- Oiwa River
- Oiwa
- Oivi Creek
- Oitatandi
- Oisa
- Oinama
- Oimeri
- Oima River
- Oil Creek
- Oila Creek
- Oikiwa
- Oija River
- Oiere
- Oidobu
- Oibo
- Oiarip
- Oiapu
- Oiafaiyufa
- Ohuru
- Ohu
- Cape Oho
- Ohirogo Creek
- Ogurataba
- Ogupone
- Ogun
- Ogu
- Ogru Two
- Ogru One
- Ogru
- Ogotana
- Ogop River
- Ogon River
- Ogondiye
- Ogomobu
- Ogomanai
- Ogogo Creek
- Ogeramnang
- Ogendie 2
- Ogelbeng
- Ogduruk
- Ogamuna
- Ogamobu Plantation
- Ogai
- Ofumpina
- Ofoyufa
- Ofi Creek
- Ofafina Government Rest House
- Oerag Creek
- Oenake Range
- Oeha Creek
- Oega
- Odpum Creek
- Uadagumbi
- O’Deas Reef
- Odaki Hills
- Sungai Oktober
- Obu Reserve
- Oburak Island
- Obura
- Obura
- Obu Point
- Obu Plantation
- Obu Mission
- Obulu
- Obulaku
- Obu Lagoon
- Obula
- Obuka
- Obu Creek
- Obubu Creek
- Obu
- Observatory Bend
- Observation Point
- Observation Island
- Observation Island
- Observation Hill
- O’Brien Shoal
- Mount Obree
- Oboro
- Oboi River
- Obo
- Obo
- Obira Creek
- Obeimi
- Obeia
- Obaoba
- Obamuma
- Obakigolo
- Obaha
- Obabie
- Ob
- Oamai River
- Oaka
- Nyimil Creek
- Nyaurengai
- Nyambolei
- Nyakombi
- Nyakandogun
- Nyada
- Nuzen
- Nuvurekakau Island
- Nuvure Island
- Nuvarege
- Nuugurigia
- Nutt Point
- Nutanuvua Island
- Nutanuvua
- Nussing Island
- Nuslik Island
- Nuslik
- Nuselawa Plantation
- Nuselawa Island
- Nusei Island
- Nusawung
- Nusaum Island
- Nusasi Island
- Nusasi
- Nusantaumatai
- Nusandaul Island
- Nusamoa Island
- Nusam Island
- Nusamani
- Nusalomon Island
- Nusalik Island
- Nusakelo Island
- Nusa Island
- Nusailas Island
- Nusailas
- Nusa Channel
- Nuru River
- Nurimobia
- Nupuru Number 2
- Nupuru Number 1
- Nupuamanda Creek