- ONE HANGZHOU BAY Cargo 431549000 9566394 USNYC
- ONE HANOI Cargo 431628000 9588093 CN NGB
- ONE HELSINKI Cargo 431350000 9588081 CNYTN
- ONE HONOLULU Cargo 431472000 9588079 SGSIN PWBGA
- ONE HOUSTON Cargo 431042000 9566382 US LAX
- ONE LIGHT Pleasure craft 431012098 — CLASS B
- ONE MACKINAC Cargo 431241000 9689603 KR PUS
- ONE MADRID Cargo 431981000 9805453 CNSHA
- ONE MAGNIFICENCE Cargo 431528000 9424900 ZA CPT
- ONE MAJESTY Cargo 431479000 9424912 JP TYO
- ONE MANEUVER Cargo 431120000 9475648 USNYC
- ONE MANHATTAN Cargo 431260000 9689615 VNCMP
- ONE MARVEL Cargo 431126000 9475612 PKKHI
- ONE MATRIX Cargo 431510000 9424924 US OAK OFF
- ONE MAXIM Cargo 431522000 9424936 BR RIO
- ONE MEISHAN Cargo 431989000 9805465 SGSIN
- ONE MINATO Cargo 431929000 9805477 CN YTN
- ONE MOTIVATOR Cargo 431566000 9475624 CN SHA
- ONE OWL Cargo 431772000 9741449 KR PUS
- ONE STORK Cargo 431986000 9784788 CA HAL
- ONE THESEUS Cargo 431027000 9356701 CNTAO
- ONE TRADITION Cargo 431808000 9769300 CNYSA
- ONE TRIBUTE Cargo 431787000 9769295 NLRTM
- ONE WREN Cargo 431888000 9784776 LKCMB → USNYC
- ONGA Cargo 431000832 — CLASS B
- ONODUKA OOYOSHIMARU Fishing 431007729 — CLASS B
- ONOKOROMARU Pleasure craft 431014098 — —
- ONTAKEMARU Fishing 431009475 — CLASS B
- ONTAKEMARU NO11 Fishing 431025953 — CLASS B
- ONTAKEMARU NO28 Fishing 431003311 — CLASS B
- ONTAKEMARU NO31 Fishing 431601467 — CLASS B
- OOGATAMARU Tanker 431012069 9836828 JP YKK OFF
- OOGUROKOUEIMARU Pleasure craft 431500950 — CLASS B
- OOHISAMARU Fishing 431009115 — CLASS B
- OOHISAMARU Pleasure craft 431501852 — CLASS B
- OOKUNI Fishing 431603000 9844198 JAPAN SEA/WM
- OOKUNI MARU Fishing 431009064 — CLASS B
- OOKUNIMARU NO66 Fishing 431006374 — CLASS B
- OONAKA KAIKOUMARU Fishing 431007205 — CLASS B
- OOSHIMA Passenger 431010254 — CLASS B
- OOSHIMA Passenger 431023315 — JP IMB → SISAKA → IHA
- OOTAKA Tanker 431000399 9424716 JP OSD OFF
- OOTAKA MARU Tanker 431008537 9801421 JP SSB / WA
- OOTAKE MARU Fishing 431026322 — CLASS B
- OOTORI NO.2 Fishing 431014518 — CLASS B
- OOTORIMARU NO.36 Pleasure craft 431602316 — CLASS B
- OOTORIMARU NO.8 Fishing 431500682 — —
- OOTSU Tug 431011125 — TXD
- OOURAMARU NO.18 Fishing 431011642 — —
- OOWADA Cargo 431015927 9907213 JP KNM YB
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