World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Owensboro | USOWB | United States of America (the) |
| Oxelösund | SEOXE | Sweden |
| Oyabu | JPOYB | Japan |
| Oyo | CGOYO | Congo |
| Oyo | NGOYO | Nigeria |
| Ozaki | JPOZX | Japan |
| Ozamis, Mindanao | PHOZC | Philippines (the) |
| Ozerko | RUOZK | Russian Federation (the) |
| Ozëry | RUOZY | Russian Federation (the) |
| Ozu | JPOOO | Japan |