- 🇳🇿OKUREI-EASTPACK RESC 12 m · Search and rescue vessel 512007175 — CLASS B
- 🇩🇪OLAND 23 m · Law enforcement vessel 211731030 — WATTENFAHRT
- 🇳🇴OLAV V 8 m · Port tender 258031080 — CLASS B
- 🇺🇸OLD DOMINION 17 m · Pilot vessel 368409350 — LYNNHAVEN, VA
- 🇺🇸OLD GLORY 115 m 367355240 — US^0X54 → 0B39
- 🇺🇸OLD LYME FIRE 225 9 m · Search and rescue vessel 338234202 — —
- 🇺🇸OLD PUSH 76 m 366996610 — US^0SXZ → 07HB
- 🇩🇪OLDENBURG 23 m · Law enforcement vessel 218010920 9928815 WHV
- 🇳🇴OLE SKAGER 660 1 29 m 257178510 — —
- 🇪🇸OLEARSO 8 m · Search and rescue vessel 225023440 — CLASS B
- 🇳🇴OLGA 14 m · Dredger 257509700 — —
- 🇧🇷OLIN CONQUEROR 84 m 710004950 9530216 P19
- 🇬🇧OLIVE HUNT 8 m 235103206 — CLASS B
- 🇺🇸OLIVE PARKER 351 m 368180640 — US^10S7 → 070P
- 🇺🇸OLIVIA 16 m · Dredger 367375030 — CLASS B
- 🇺🇾OLIVIA 59 m · Anti-pollution vessel 770576392 9399595 LA PALOMA
- 🇧🇷OLIVIA BVT 59 m · Anti-pollution vessel 710006265 9399595 S SEBASTIAO
- 🇺🇸OLIVIA ROSE 73 m 367644590 7222152 US^0BS2 → 0W7Z
- 🇩🇪OLSBORG 8 m · Law enforcement vessel 211177560 — —
- 🇺🇸OLYMPIC 17 m · Pilot vessel 338548858 — CLASS B
- 🇺🇸OMAHA 20 m · Pilot vessel 367102030 — MERAUX FLT
- 🇪🇸OMARSUB 54 m · Dredger 224298290 8747111 VALENCIA
- 🇿🇦OMS DEFIANT 15 m 601951100 — CLASS B
- 🇿🇦OMS SHUTTLE 14 m · Noncombatant ship 601326600 — —
- 🇪🇸OMVAC ARES 55 m · Dredger 224209350 9392717 MAPTM
- 🇪🇸OMVAC CATORCE 74 m · Dredger 224627000 9930181 GI GIB
- 🇪🇸OMVAC CINCO 56 m · Dredger 224297000 8302765 ES ALG DREDGING OPS
- 🇪🇸OMVAC DIEZ Dredger 225426000 9643817 BRREC
- 🇪🇸OMVAC DOCE 61 m · Dredger 224925000 9757199 MARIN
- 🇵🇹OMVAC DOCE 61 m · Dredger 255917440 9757199 LE HAVRE FRANCE
- 🇵🇹OMVAC EUME 78 m · Dredger 255916280 9671620 DOHAI
- 🇪🇸OMVAC OCHO 52 m · Dredger 225386000 8658475 GIGIB
- 🇪🇸OMVAC REDES 56 m · Dredger 224229670 9417907 MAPTM
- 🇪🇸ONA GUB 8 m · Search and rescue vessel 225999245 — —
- 🇨🇦ONC WAVEGLIDER 3 m 316053128 — —
- 🇳🇱ONDERNEMING 4 21 m · Dredger 244700676 — WARMOND
- 🇺🇸ONECURE 153 m 368006870 9837212 VALDEZ
- 🇷🇺ONEZHSKIY ZALIV 70 m · Dredger 273459250 8225735 ARKHANGELSK
- 🇨🇳ONWA52112 29 m 412552112 — CLASS B
- 🇹🇷ONWASHENZHEN 29 m 271000002 1078743 —
- 🇨🇳ONWASHENZHEN 29 m 412552005 — —
- 🇨🇳ONWASHENZHEN 29 m 412552109 — CLASS B
- 🇧🇷ONWASHENZHEN 29 m 710005981 — CLASS B
- 🇪🇸OPEN ARMS 37 m · Search and rescue vessel 224772000 7325887 ES TAR
- 🇺🇸OPERATOR 01 Search and rescue vessel 338480339 — CLASS B
- 🇩🇰OPHELIA 15 m · Dredger 219001214 — HELSINGOR
- 🇸🇬OPL 168 17 m · Noncombatant ship 563021750 — CLASS B
- 🇸🇬OPL 22 24 m · Noncombatant ship 563037860 — CLASS B
- 🇸🇬OPL 55 22 m · Noncombatant ship 563035690 — CLASS B
- 🇸🇬OPL 99 18 m · Noncombatant ship 563025180 — —
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