World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Odunluk | TRODU | Türkiye |
| Oegstgeest | NLOGE | Netherlands |
| Oehling | ATXAE | Austria |
| Oeiras | PTOEI | Portugal |
| Oelegem | BEOEL | Belgium |
| Oeselgem | BEOSG | Belgium |
| Oestrich-Winkel | DEOSW | Germany |
| Oevel | BEOEV | Belgium |
| Offenbach | DEOFF | Germany |
| Ofra | ILOFR | Israel |