| Sr. No. | Town and City | Type |
|---|
| 1 | Oamaru Bay | Stream |
| 2 | Ocean Bay | Stream |
| 3 | Ocean Point | Point |
| 4 | Ocean View Crescent, Rarangi | Street/Road |
| 5 | Oddstone | Location |
| 6 | Odwyers Road, Rapaura | Street/Road |
| 7 | Ohana | Locality |
| 8 | Ohana Bay | Bay |
| 9 | Ohauparuparu Bay | Suburb/Town |
| 10 | Ohinetaha Bay | Bay |
| 11 | Ohingaroa Bay | Bay |
| 12 | Okahoka Point | Point |
| 13 | Okahu Bay | Stream |
| 14 | Okaramio | Suburb/Town |
| 15 | Okaramio River | Stream |
| 16 | Okaramiro Valley Farm | Location |
| 17 | Okarewa Point | Point |
| 18 | Okatiki Point | Point |
| 19 | Oke Rock | Island |
| 20 | Okiwa Bay | Bay |
| 21 | Okiwa Place, Anakiwa | Street/Road |
| 22 | Okiwi Bay | Suburb/Town |
| 23 | Okiwi Crescent, Okiwi Bay | Street/Road |
| 24 | Okoha | Location |
| 25 | Okoha Saddle | Pass |
| 26 | Okukari Bay | Bay |
| 27 | Okuri Bay | Bay |
| 28 | Okuri Peak | Location |
| 29 | Okuri Point | Point |
| 30 | Old Coach Road, Havelock | Street/Road |
| 31 | Old Homewood Bay | Bay |
| 32 | Old Hway Canvastown, Canvastown | Street/Road |
| 33 | Old Man Hut | Location |
| 34 | Old Man | Stream |
| 35 | Old Mans Head | Point |
| 36 | Old Middlehurst Hut | Location |
| 37 | Old Mill Road, Okiwi Bay | Street/Road |
| 38 | Old Pudding | Hill |
| 39 | Old Rainbow Homestead | Location |
| 40 | Old Renwick Road, Mayfield | Street/Road |
| 41 | Old Renwick Road, Rapaura | Street/Road |
| 42 | Old Renwick Road, Thomsons Ford | Street/Road |
| 43 | Oldham Stream | Stream |
| 44 | Olive Stream | Stream |
| 45 | Oliver Place, Anakiwa | Street/Road |
| 46 | Omahakie Stream | Stream |
| 47 | Omaka Aerodrome | Location |
| 48 | Omaka Bivouac | Location |
| 49 | Omaka Downs | Location |
| 50 | Omaka River | Stream |
| 51 | Onahau | Hill |
| 52 | Onahau Bay | Suburb/Town |
| 53 | Onahau Road, Onahau Bay | Street/Road |
| 54 | Onamalutu | Suburb/Town |
| 55 | Onamalutu Reserve | Location |
| 56 | Onamalutu River | Stream |
| 57 | Onamalutu Road, Onamalutu | Street/Road |
| 58 | Onapopoia | Point |
| 59 | Onapua Bay | Suburb/Town |
| 60 | Onapua, Onapua Bay | Street/Road |
| 61 | Onario Point | Point |
| 62 | Onauku Bay | Bay |
| 63 | One Tree | Hill |
| 64 | One Tree Point | Stream |
| 65 | Onehunga Bay | Stream |
| 66 | Onehunga | Stream |
| 67 | Onepipi Bay | Bay |
| 68 | Onetea Bay | Bay |
| 69 | Onopopiti Bay, Arapaoa Island | Street/Road |
| 70 | Opani-Aputa Point | Location |
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