World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Sitrah | BHSIT | Bahrain |
| Sixaola/Talamanca | CRSIX | Costa Rica |
| Sizewell Beach | GBSZB | United Kingdom |
| Siziman | RUSIZ | Russian Federation (the) |
| Sjovar havn | FOSJO | Faroe Islands |
| Sjøholt | NOSJO | Norway |
| Sjøvegan | NOSJV | Norway |
| Sjursøja/Oslo | NOSJU | Norway |
| Skadovsk | UASKD | Ukraine |
| Skafidia | GRSKD | Greece |