 | Oak |  | 8211629 | Saeftinge |
 | Ocean Glory |  | 9368625 | Antwerpen |
 | Oceanic II |  | 8602945 | Rotterdam |
 | Oder |  | 9454802 | Antwerpen |
| Okapi |  | 7129336 | Europort |
| Okko Tom Brook |  | 9375800 | Rotterdam |
 | Olinda Castle | | 7916208 | Antwerpen |
 | Olivier | | 8515283 | Terneuzen |
| Olma | | 8004806 | Rotterdam |
| Olza | | 8919843 | Gent |
 | Omskiy-100 |  | 8866723 | Papenburg |
| Omskiy-135 | | 8881723 | Rotterdam |
| Onego |  | 9021083 | Antwerpen |
 | Onego Bilbao |  | 9456733 | Rotterdam |
| Onego Explorer |  | 9362815 | Antwerpen |
 | Onego Isle | | 9626156 | Rotterdam |
| Onego Maas | | 9535618 | Rotterdam |
| Onego Mariner | | 9631369 | Rotterdam |
| Onego Merchant |  | 9277321 | Barendrecht |
| Onego Power | | 9190119 | Terneuzen |
| Onyx |  | 8801620 | Cuxhaven |
| Oomskiy-133 | | 8873336 | Cuxhaven |
| Oomskiy-134 | | 8881711 | Cuxhaven |
| Oostvoorne | | 9142655 | Europort |
 | Oostzee | | 7711505 | Millingen |
| Opus | | 7900091 | Gent |
 | Ora Chelsea | | 8503084 | Rotterdam |
| Orade |  | 9008275 | Emmerich |
 | Orion |  | 9118018 | Rotterdam |
| Osakana |  | 9253870 | Antwerpen |
| OSC Vlistdiep | | 9414187 | Rotterdam |
 | Oslo Bulk 4 |  | 9589956 | Antwerpen |
 | Östanhav |  | 8129395 | Antwerpen |
 | Osteborg | | 9033866 | Papenburg |
| Ostedijk | | 9349980 | Antwerpen |
| Osterems | | 9148207 | Fischerhütte |
 | Ostra | | 9045742 | Antwerpen |
 | Ovar |  | 9279020 | Sluiskil |