- ONEZHSKIY ZALIV Special purpose 273459250 8225735 ARKHANGELSK
- ONIKS Tanker 273121120 9439383 SGSIN
- ONIKS Cargo 273148310 9037070 RU SVE
- ONIX Fishing 273279580 8650239 VZMORYE
- ONIX Other 273435130 8943478 — —
- OPALA Fishing 273395230 9219537 OME
- OPHELIA Tanker 273345030 8010427 RULED
- OPOLYE Other 273362100 8728050 — —
- OPTIMIST Fishing 273811100 8897552 OME
- OPTIMUS Special purpose 273396370 9105152 RU MMK
- ORAKUL Tanker 273279270 9299666 TR TUZLA
- ORDOVIK Other 273454600 8409032 RU NJK
- OREHOVO ZUEVO Passenger 273317470 — —
- OREL-4 Cargo 273330970 8853714 RU ASF
- OREL-6 Cargo 273331970 8853609 ASTRAKHAN
- ORENBURG Tanker 273327420 9687992 IR AMP
- ORENBURG Tanker 273353580 9537109 RUULU
- ORENBURG Other 273414900 8887284 — —
- ORESHEK Passenger 273120710 — CLASS B
- ORGANIZATOR Passenger 273348640 — —
- ORIENT Tanker 273346860 9061617 ZPV
- ORIENTAL Tanker 273356730 9054638 KHOLMSK
- ORION Fishing 273264210 — —
- ORION Tanker 273276080 9294264 FOR ORDERS
- ORION Cargo 273298140 9164029 CN TAO
- ORION Cargo 273312950 7920546 KR PUS
- ORION Fishing 273611360 9847839 MURMANSK
- ORION Fishing 273612680 9638953 RU VVO
- ORION A Tanker 273338630 8107737 NOVOROSSIYSK
- ORION1 Pleasure craft 273260350 — CLASS B
- ORLAN Tug 273311770 — —
- ORLAN Tug 273614470 9064360 ARHANGELSK
- ORLETS Tanker 273131700 8727903 SEVERODVINSK
- ORRIE Tug 273255940 9581394 RU KHO
- ORSK Other 273312480 8625492 KORSAKOV
- ORTUS Other 273212740 — CLASS B
- ORVAR Fishing 273323130 8714554 RUMMK
- ORVEN Tanker 273125540 9224441 MURMANSK
- OS 309 Tanker 273370870 — CLASS B
- OS 40 Tanker 273363650 — CLASS B
- OS 7 Tanker 273371870 — —
- OSETROVO Cargo 273447790 8948349 ASTRAHAN
- OSIPENKO Cargo 273297380 — TEST HARBOR
- OSP 7 Tug 273367530 — —
- OSTANKINO Fishing 273246800 8522157 FISHING GROUND
- OSTAP SHEREMETA Other 273459710 9624225 NAKHODKA
- OSTEN Tanker 273355760 9148893 VST
- OSTROV ATLASOVA Cargo 273216750 9122760 RU KZS
- OSTROV ITURUP Fishing 273290500 8847246 KR PUS
- OSTROV KUNASHIR Fishing 273394760 9060431 BUSAN
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