World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Massenhoven | BEMHN | Belgium |
| Masset | CAMSS | Canada |
| Massinga | MZMSG | Mozambique |
| Mastichari Kos | GRMXK | Greece |
| Masuda, Kagoshima | JPMDJ | Japan |
| Masuda, Shimane | JPMSD | Japan |
| Masulipatnam | INMAP | India |
| Matâ'utu | WFMAU | Wallis and Futuna |
| Matadi | CDMAT | Congo, The Democratic Republic of the |
| Matama | JPMAM | Japan |