- OOURAMARU NO.18 Fishing 431011642 — —
- OOWADA Cargo 431015927 9907213 JP SKD OFF
- OOYODO Tug 431999507 — —
- OOZU MARU Tanker 431008812 9805154 JP CHB OFF
- OOZU MARU NO.10 Tanker 431004666 9665970 JP KUH OFF
- OPERA WHITE Cargo 432622000 9342748 AU PTJ
- ORANGE EHIME Passenger 431011673 9820946 JP OSA 4S
- ORANGE HOPE Passenger 431501801 9089085 JP UKB
- ORANGE OSAKA Passenger 431012251 9827097 JP OSA
- ORANGE-GUREISU Passenger 431000523 9140310 YANAI → = → MATSUYAMA
- ORANGE-KYUSHU Passenger 431000221 9425112 JP USK
- ORANGE-SHIKOKU Passenger 431000479 9442251 JP USK
- ORATORIO Cargo 431334000 9687679 CN JTG
- ORCHID Tug 431022486 — CLASS B
- ORCHID ACE Cargo 432651000 9381677 PA BLB
- ORE NOUMEA Cargo 432882000 9503249 BR TUB
- ORENGE-JYUPITA Passenger 431000501 9056507 YAN → MYJ
- ORIENTAL ACE Tanker 431526000 9203241 JP CHB I-1
- ORIENTAL NO.7 Tug 431006366 — —
- ORIHIME Other 432886000 9621235 — —
- ORIIBU Cargo 431600627 — CLASS B
- ORION Special purpose 431001618 — JP YOK
- ORION Tug 431004877 9672674 JP NMX
- ORION Sailing 431012706 — CLASS B
- ORION Tug 431021175 — CLASS B
- ORION Tanker 431301768 — JP YKK OFF
- ORUKA Fishing 431011193 — CLASS B
- OSAKIMARU Tug 431100192 8890102 CLASS B
- OSHIMA MARU Fishing 431625000 9874923 JP NMX /WM
- OSHIMA MARU Other 431886000 — JP KMX
- OSHIMA YURI MARU Cargo 431501872 9382255 JP MKX OFF
- OSHORO MARU Other 431001010 9699983 JP HHE
- OSUMI Tug 431807000 9883699 KOJ
- OSYMANDYAS Other 431027622 — —
- OTAGAWA Cargo 431001328 9599212 JP SMZ SODESI-6/7
- OTOMARU NO.18 Pleasure craft 431022905 — CLASS B
- OTOMARU NO58 Fishing 431000975 — CLASS B
- OTORI Tug 431007798 — CLASS B
- OTOSHUKIMARU Fishing 431020983 — —
- OTOWA Tanker 431023752 1022902 JP MIZ B
- OUEI MARU Cargo 431008079 9781803 JP KCZ
- OUGIMARU Fishing 431015238 — —
- OUKA Cargo 431000488 8738146 JP CHB ITIHARA OFF
- OUKA MARU Fishing 431029394 — CLASS B
- OUKAI MARU NO 5 Cargo 431016791 9918365 JP KSM
- OUKAMARU Fishing 431011823 — —
- OUKOUMARU Cargo 431012947 — JP TBN 1000T
- OUMI Tug 431999683 — —
- OURA Cargo 431000335 — JP AMX
- OUSEI Pleasure craft 431029125 — —
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