Regions of New Zealand
- Ongarue River
- Ongarue
- Onga Onga Stream
- Onga Onga
- Ongangana Stream
- Ongaha Stream
- Onewhero Bay
- Onewhero
- One Tree Ridge
- One Tree Point
- One Tree Hill
- One Tree Hill
- One Tree Hill
- One Tree Hill
- Onetea
- Onetaua Stream
- Onetangi Bay
- Onetangi
- Onetai Stream
- Oneroa Bay
- Oneroa Bay
- Onerahi
- Onepu Stream
- Onepu
- Onepoto
- Onepoto
- One Mile Creek
- One Mile Creek
- Onekura
- Onekawa
- Onekaka River
- Onekaka Ridge
- Onekaka
- Onekainga
- Onehunga Bay
- Onehunga
- Onauku Bay
- Onauku
- Onapua Bay
- Onapua
- Onamalutu River
- Onamalutu
- Onaia Stream
- Onahau River
- Onahau Bay
- Onahau
- Onaero River
- Onaero
- Omutu Creek
- Omutu
- Omuia
- Omotumotu Creek
- Omori Stream
- Omokoroa Beach
- Omokoroa
- Omokoroa
- Omokoiti Flats
- Omoeroa River
- Omoeroa Range
- Omoeroa Bluff
- Omoehu
- Omoana
- Omnibus Creek
- Omirinoko Stream
- Omimi
- Omihi River
- Omihi River
- Omihi Creek
- Omihi
- Omiha
- Omeruiti
- Omeo Creek
- Omeheu Canal
- Omega Creek
- Omega
- Omaunu Stream
- Omaumau River
- Omaui Island
- Omau
- Omata Stream
- Omata
- Omata
- Omaru River
- Omarua
- Omaru
- Omaroro
- Omarama Stream
- Omarama Saddle
- Omarama
- Omarakokere
- Omapu
- Omapu
- Lake Omapere
- Omapere
- Omanuka Lagoon
- Omanu Creek
- Omano
- Omango Stream
- Omanawa Stream
- Omanawa Falls
- Omanawa
- Omanaia River
- Omanaia
- Omana
- O'Malley Creek
- Mount O'Malley
- Omakere Stream
- Omakau
- Omaka River
- Omaka
- Omaio Bay
- Omaio
- Omaia
- Omahuta
- Omahu Stream
- Omahu Stream
- Omahu Station
- Omahu
- Omahu
- Omaha River
- Omahanui
- Omahaki Stream
- Omaha Bay
- Omaha
- Mount Olympus
- Mount Olympus
- Mount Olympus
- Mount Ollivier
- Olivine Range
- Olivine Branch
- Oliver Point
- Mount Oliver
- Mount Oliver
- Mount Olive
- Old Point
- Old Pa
- Old Man Swamp
- Old Mans Point
- Old Man Rock
- Old Man Range
- Old Man Range
- Old Man Peak
- Old Man Peak
- Old Man Creek
- The Old Man
- Old Man
- Old Man
- Old Hut Creek
- Old Hut Creek
- Old Hut Creek
- Olderog Creek
- Okute River
- Okuru River
- Okuru
- Okuri Point
- Okure Bay
- Okura Stream
- Okura River
- Okupu
- Ōkupe Lagoon
- Okupata Stream
- Okupata Stream
- Okupata
- Okuku River
- Okuku Range
- Okuku Pass
- Okuku Hill
- Okukari Bay
- Okukari
- Okuhu Stream
- Okotinga
- Okota
- Okoropunga Stream
- Okoroire Station
- Okoroire
- Okoroa
- Okoki
- Okoia Lake
- Okoia
- Okoeke Stream
- Oklahoma
- Okiwiriki
- Okiwi Bay
- Okiwi Bay
- Okiwi
- Okiwa
- Okirau Stream
- Okiore
- Okiore
- Okete
- Okere Falls
- Okehu Stream
- O'Keefe Creek
- Okaweu Stream
- Okawa Stream
- Okawa
- Okawa
- Okau Stream
- Okauia
- Okau-awa Stream