World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Oppegård | NOOPG | Norway |
| Oppenheim | DEOPP | Germany |
| Opua | NZOPX | New Zealand |
| Oracabessa | JMORC | Jamaica |
| Oran | DZORN | Algeria |
| Oran Dry Port | DZ2ON | Algeria |
| Orange Beach | USOBC | United States of America (the) |
| Oranjestad | AWORJ | Aruba |
| Oranzherei | RUOZE | Russian Federation (the) |
| Oras/Catbalogan | PHORS | Philippines (the) |