- 🇺🇸OLIVER 30 m · Towing vessel 368228930 8644357 MIAMI
- 🇺🇸OLIVER C. SHEARER 42 m 367412610 — US^0618
- 🇳🇬OLIVIA GRACE — 657302400 8770388 —
- 🇺🇸OLIVIA W 8 m · Towing vessel 368232180 — CLASS B
- 🇫🇮OLLI 20 m 230074470 — KAUKAS
- 🇩🇪OLM 29 m 211538260 — UNTERHALTUNG EHK
- 🇸🇬OLNG MASIRAH 32 m 563089040 9715373 SGP
- 🇴🇲OLNG MUTTRAH 32 m 461000139 9715385 —
- 🇴🇲OLNG SEEB 32 m 461000136 9715361 MINA ALFAHL
- 🇴🇲OLNG SUR 32 m 461000137 9715359 SINGAPORE
- 🇳🇴OLOF 15 m · Towing vessel 257883900 — CLASS B
- 🇲🇾OLV SUPPORTER 48 m 533374000 9431329 CAKERAWALA
- 🇲🇾OLV VENTURE 1 85 m 533130492 9693915 CKR FIELD
- 🇮🇸OLVER 16 m 251516110 — —
- 🇻🇨OLYMPIA — 375094000 9637545 GUAM
- 🇬🇧OLYMPIAN 15 m 235091452 — LONDON
- 🇳🇴OLYMPIC BOREAS 89 m 257759000 9977787 BK3 OWF
- 🇮🇩OLYMPIC DOLPHIN — 525003096 — CLASS B
- 🇺🇸OLYMPIC SCOUT 28 m · Towing vessel 367183360 57121100 SEATTLE
- 🇮🇳OLYMPUS 64 m 419001555 9437012 BFL
- 🇺🇸OLYMPUS TLP — 338193276 — MC-807B
- 🇳🇬OMAMBALA RIVER 44 m 657267000 9244128 —
- 🇴🇲OMAN EXPLORER 34 m 461000319 — MUSCAT
- 🇻🇨OMAR DANKALI — 377287000 9681089 DJIBOUTI
- 🇲🇺OMAR IV — 645631000 — CLASS B
- 🇲🇾OMBAK 1 — 533033215 — —
- 🇦🇪OMEED TAHER — 470682000 9188300 HAMRIYAH
- 🇳🇱OMEGA 16 m 244869866 — CLASS B
- 🇹🇷OMEGA — 271045762 — CLASS B
- 🇧🇷OMEGA 26 m 710028080 9083770 MACEIO
- 🇹🇷OMEGA 6 — 271047216 — CLASS B
- 🇹🇷OMERCAN — 271010229 — CLASS B
- 🇮🇷OMID POL 50 m 422755700 8737702 —
- 🇮🇷OMIDAN 1 — 422667000 9453274 —
- 🇮🇷OMIDAN 3 — 422790000 9646962 —
- 🇮🇷OMIDAN 4 25 m 422002900 9615298 —
- 🇰🇲OMIDAN 5 49 m 620800701 9636292 OMAN
- 🇮🇷OMIDAN 8 — 422280700 9850496 LAVAN
- 🇵🇦OML INTERVENTION II 68 m 351687000 9787338 TPS3
- 🇵🇦OML JACOB — 352001923 9765691 UMM SAIF
- 🇨🇦OMNI COASTAL 26 m 316006562 6923084 TOR
- 🇲🇾OMNI STELLA 61 m 533065600 9625334 KEMAMAN
- 🇮🇷OMRANI 11 54 m 422617000 9425459 —
- 🇮🇷OMRANI 12 53 m 422834000 9478535 SOHAR/OMN
- 🇳🇬OMS IKPOBA — 657207000 9888821 —
- 🇳🇬OMS IRRUA 38 m 657195100 9881524 NNS PATHFINDER
- 🇳🇬OMS KINGSTON — 657111185 — —
- 🇳🇬OMS OKUN 38 m 657201900 9888833 NNS PATHFINDER
- 🇳🇬OMS OSSE 38 m 657201800 9888845 OKONU
- 🇦🇷ONA DON LORENZO 30 m 701006289 9328388 BS AS
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