- NOVA STELLA Pleasure craft 240810600 — —
- NRG Pleasure craft 239710300 — CLASS B
- NUTMEG Sailing 240172600 — LEFKAS
- O'NATALINA Pleasure craft 241524000 1002940 PIRAEUS
- O'RION Pleasure craft 237697600 8697433 ALIMOS
- OAK Pleasure craft 240430500 8357083 SEF
- OASIS Pleasure craft 240603800 — CLASS B
- OASIS Pleasure craft 241401000 1009041 ATHENS MARINA
- OCEAN BOULEVARD 461 Sailing 240708300 — CLASS B
- OCEAN SONG Sailing 240099800 — —
- OCEAN STAR Tanker 241949000 9978688 JPTXD- → INVAD
- OCEANE 2 Pleasure craft 239875900 — FLISVOS
- OCTOPUS Pleasure craft 240503900 — CLASS B
- ODYSSEAS Other 241985000 9486568 — —
- ODYSSEUS A Sailing 240041200 — CLASS B
- OINOUSSAI III Passenger 237014600 8984745 PERAMA - OINOUSSES
- OKIALOS Passenger 240671400 9989601 P-A-P
- OKTANA Sailing 240517500 — OLYMPIC MARINE
- OL ATHENA Sailing 240496500 — —
- OLEA II Sailing 240652800 — —
- 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 CNNBO
- OLYMPIC LUCK Tanker 241340000 9424211 AEFJR
- OLYMPIC TARGET Tanker 241411000 9468853 PAAML
- OLYMPIC TROPHY Tanker 241412000 9445461 CCLA
- OLYMPIOS ERMIS Passenger 240563500 1032153 KOS.NIS.KOS.NIS
- OLYMPIOS ZEUS Passenger 237034600 8969020 KALYMNOS-MASTICHARI
- 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 DREAM Sailing 240656100 — CLASS B
- ONE FEELING Sailing 240658200 — CLASS B
- ONE PASSION Sailing 240657200 — CLASS B
- ONE THOUGHT Sailing 240586300 — CLASS B
- ONLY ONE Sailing 240743700 — CLASS B
- ONYX Pleasure craft 240524900 — CLASS B
- OPERA Pleasure craft 240207600 — —
- OPTIMUM S Other 240429500 — —
- ORCA Tug 237454900 — PERAMA
- ORCA Other 237594800 8744054 CLASS B
- OREO Pleasure craft 240316900 — CLASS B
- ORESTEIA Sailing 239905500 — —
- ORIE Sailing 240627600 — —
- ORIGINE Sailing 240734900 — CLASS B
- ORION IV Passenger 240804100 1153828 —
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