World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Ovalle | CLOVL | Chile |
| Overberg | NLOVG | Netherlands |
| Overboelare | BEOLE | Belgium |
| Overpelt | BEOVE | Belgium |
| Overschild | NLOSK | Netherlands |
| Ovidiu | ROOVI | Romania |
| Oviedo | USZOD | United States of America (the) |
| Owase | JPOWA | Japan |
| Owen Sound | CAOWS | Canada |
| Owendo | GAOWE | Gabon |