World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Orsoy | DEORS | Germany |
| Orth/Fehmarn | DEORT | Germany |
| Ortigueira | ESOTG | Spain |
| Ortnevik | NOORV | Norway |
| Ortona | ITOTN | Italy |
| Ortviken | SEORT | Sweden |
| Örviken | SEORV | Sweden |
| Oryakhovo | BGOKH | Bulgaria |
| Orzola | ESOZL | Spain |
| Os | NOOOS | Norway |