World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Oura, Saga | JPOOA | Japan |
| Oura/Ariake | JPOUA | Japan |
| Oura/Kamitsushima | JPOUR | Japan |
| Oura/Kasaoka | JPOOR | Japan |
| Oura/Marugame | JPORX | Japan |
| Oura/Uchinoura | JPORR | Japan |
| Ouranópolis | GROUR | Greece |
| Outes | ESOUT | Spain |
| Outlook | US3VC | United States of America (the) |
| Ouzai | LBOUZ | Lebanon |