- 🇸🇪ORJAN 15 m 265631430 — CLASS B
- 🇳🇱ORKA 15 m · Towing vessel 244700070 — LAGE ZWALUWE
- 🇹🇷ORKA 1 — 271042535 — —
- 🇹🇷ORKA DENIZ 17 m 271052977 — CLASS B
- 🇹🇷ORKINOS — 271010377 — CLASS B
- 🇹🇷ORKOZ 53 — 271044374 8595568 CLASS B
- 🇷🇺ORLAN — 273311770 — —
- 🇷🇺ORLAN — 273614470 9064360 ARHANGELSK
- 🇸🇬ORLANDO DOLPHIN — 563086530 9762077 SUDONG S'PORE
- 🇳🇴ORMEN 8 m 259013930 — —
- 🇬🇧ORMESBY CROSS 33 m 235000032 9206944 GBTYN
- 🇫🇷ORPHIE Towing vessel 228855400 — —
- 🇷🇺ORRIE 36 m 273255940 9581394 RU KHO
- 🇹🇷ORSA PILOT I 11 m 271043782 — CLASS B
- 🇹🇷ORSA PILOT II — 271040168 — CLASS B
- 🇩🇰ORSTED EVAULATOR 12 m 219033037 — FAABORG
- 🇮🇹ORTIGIA 25 m 247428600 9981881 AUGUSTA
- 🇵🇦ORV TOPAZ 40 m 352006475 1096018 SINGAPORE
- 🇬🇧ORYX — 235034959 — FAWLEY
- 🇹🇿ORYX 39 m 677043800 7726500 GUIRIA
- 🇲🇾OS ONE 83 m 533170304 9701669 SB-SMG-SMJT-F
- 🇹🇼OS6 — 416005456 — —
- 🇧🇪OSAKA 26 m 205287290 — CLASS B
- 🇯🇵OSAKIMARU 38 m 431100192 8890102 CLASS B
- 🇧🇬OSAM 34 m 207072388 — RUSE
- 🇲🇺OSCAR 18 — 645328000 — CLASS B
- 🇸🇪OSCAR FALKMAN 21 m · Towing vessel 265506070 — —
- 🇬🇧OSCAR OWL Towing vessel 235089479 — CLASS B
- 🇨🇴OSCAR PAEZ JR 32 m 730152781 9517848 SANTA MARTA
- 🇺🇸OSCEOLA 90 m · Towing vessel 367482470 — MIAMI
- 🇮🇩OSEANIK 02 — 525401238 9970715 SAMARINDA
- 🇺🇸OSFD32 11 m 338464997 — CLASS B
- 🇺🇸OSG ENDURANCE 204 m 367501540 9441477 TAMPA
- 🇺🇸OSG HORIZON 215 m 338447000 9436549 ARANSAS PASS,TX
- 🇵🇦OSHAN SUPPLIER 55 m 352801000 9588627 UMM SHAIF
- 🇮🇩OSHIMA 117 m 525023399 8514150 MARUNDA
- 🇳🇬OSHONE 32 m 657295600 9764673 EBOKFIELD
- 🇳🇨OSIRIS 9 m 540023120 — CLASS B
- 🇲🇹OSIRIS 2 — 256005052 — MXK
- 🇩🇪OSK RENDSBURG 24 m 211116660 9755567 DKROD
- 🇵🇱OSKAR 21 m 261186286 — —
- 🇮🇳OSL DERDGER 4 26 m 419801924 — CLASS B
- 🇮🇳OSL DREDGER 5 25 m 419801925 — CLASS B
- 🇮🇳OSL SHOURYA 61 m 419002189 9630119 MU PLU
- 🇮🇳OSL STELLAR 45 m 419000596 9592513 SAGAR SAMRAT
- 🇮🇳OSL TEJAS 66 m 419002187 9359167 IN BOM J1
- 🇮🇳OSL VAJRA 73 m 419002190 9331323 TBC
- 🇹🇻OSL-TRIUMPH 72 m 572893220 9269491 GHASHA FIELD
- 🇹🇷OSMAN BEY 73 m 271046820 9421764 FILYOS
- 🇻🇪OSMANYELA — 775990628 — —
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