UpAlphabetical listing of Places in Northern Samar
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ocbol | city | Northern Samar | Philippines | 12.38 | 125.09 | 49 | 20822 |
| Ohio | city | Northern Samar | Philippines | 12.29 | 125.02 | 72 | 15682 |
| Old Rizal | city | Northern Samar | Philippines | 12.51 | 124.59 | 72 | 7350 |
| Oleras | city | Northern Samar | Philippines | 12.45 | 125.04 | 3 | 22237 |
| Omaga | city | Northern Samar | Philippines | 12.58 | 124.28 | 190 | 8599 |
| Omagis | city | Northern Samar | Philippines | 12.66 | 125.07 | 3 | 6378 |
| Ona | city | Northern Samar | Philippines | 12.34 | 124.68 | 157 | 12218 |
| Onay | city | Northern Samar | Philippines | 12.59 | 125.01 | 108 | 10382 |
| Opang | city | Northern Samar | Philippines | 12.43 | 125.05 | 9 | 22068 |
| Opano | city | Northern Samar | Philippines | 12.43 | 125.05 | 9 | 22068 |
| Opong | city | Northern Samar | Philippines | 12.38 | 125.03 | 160 | 18370 |
| Orang | city | Northern Samar | Philippines | 12.52 | 125.13 | 111 | 21121 |
| Oring | city | Northern Samar | Philippines | 12.57 | 125.07 | 0 | 14057 |
| Osmeña | city | Northern Samar | Philippines | 12.52 | 125.15 | 337 | 20224 |
| Osmeña | city | Northern Samar | Philippines | 12.38 | 125.07 | 26 | 20685 |
| Oson | city | Northern Samar | Philippines | 12.39 | 124.19 | 0 | 6216 |
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