- OLEA II Sailing 240652800 — CLASS B
- OLYMPIC CHAMPION JET High-speed craft 240348000 9329095 GR PIR
- OLYMPIC FLAG Tanker 240168000 9271341 AE KLF —
- OLYMPIC FUTURE Tanker 240221000 9271353 AEFJR —
- OLYMPIC LEOPARD Tanker 241380000 9470040 FOR ORDERS —
- OLYMPIC LIGHT Tanker 241330000 9424273 PEBGC
- OLYMPIC LUCK Tanker 241340000 9424211 THSRI
- OLYMPIC TARGET Tanker 241411000 9468853 SINGAPORE PEBGC
- OLYMPIC TROPHY Tanker 241412000 9445461 TWKHH
- OLYMPIOS ERMIS Passenger 240563500 1032153 KOS.NIS
- OLYMPIOS ZEUS Passenger 237034600 8969020 KALYMNOS ISL
- OMBRA Pleasure craft 240649800 — CLASS B
- OMIROS 2 Sailing 240235400 — CLASS B
- ONAR Sailing 240650900 — CLASS B
- ONCE MORE Pleasure craft 240760100 — D
- ONE Pleasure craft 240545000 — CLASS B
- ONE DAY Pleasure craft 240341700 — —
- ONE DREAM Sailing 240656100 — CLASS B
- ONE FEELING Sailing 240658200 — CLASS B
- ONE PASSION Sailing 240657200 — CLASS B
- ONE SECRET Sailing 240819400 — —
- ONE THOUGHT Sailing 240586300 — CLASS B
- ONIRO Pleasure craft 239806500 — —
- ONLY ONE Sailing 240743700 — CLASS B
- ONYX Pleasure craft 240524900 — CLASS B
- OOGA CHAKA Pleasure craft 240276100 — —
- OPERA Pleasure craft 240207600 — —
- OPTIMUM S Pleasure craft 240429500 — CLASS B
- ORCA Other 237594800 8744054 PERAMA
- OREO Pleasure craft 240316900 — CLASS B
- ORESTEIA Sailing 239905500 — —
- ORFEAS Passenger 239468500 — CLASS B
- ORFEAS Tug 240281500 — —
- ORIE Sailing 240627600 — —
- ORIGINE Sailing 240734900 — CLASS B
- ORION IV Passenger 240804100 1153828 CLASS B
- ORION STAR Pleasure craft 240763500 — —
- ORSALIA Pleasure craft 240172800 — ATHEN
- ORSALIA Sailing 240334200 — CLASS B
- OSIA METHODIA Passenger 240220400 9891622 —
- OSIA PARASKEVI Fishing 237383000 8788024 —
- OSPREY Pleasure craft 240631900 — CLASS B
- OSTRIA Pleasure craft 239019300 — —
- OUR DREAM Pleasure craft 239042800 — PORTO CARRAS N. MAR
- OURANOS Pleasure craft 241460000 9807530 FLISVOS
- OURANOS SHADOW Pleasure craft 240583200 — CLASS B
- OUSYRA Sailing 240366100 — —
- OUZO POWER Pleasure craft 240643600 — —
- OVAL Pleasure craft 240334100 8354378 ZEA
- OXYGEN 8 Pleasure craft 237929800 — CLASS B
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