| (Sort by) Author | (Sort by) Title | (Sort by) Edition |
| O'Brien, Conor | Across Three Oceans | Second impression |
| O'Brien, Conor | Deep-Water Yacht Rig | |
| O'Brien, Conor | From Three Yachts | |
| O'Brien, Conor | On Going to Sea in Yachts | |
| O'Brien, Conor | Practical Mans Cruiser [The] | |
| O'Brien, Conor | Small Ocean-Going Yacht [The] | |
| O'Brien, Conor | Yacht Gear and Gadgets | |
| O'Brien, F T | Early Solent Steamers | |
| O'Byrne, Robert | O'Byrne's Naval Annual for 1855 | Facsimile reprint Cornmarket 1969 |
| O'Byrne, William R | Naval Biographical Dictionary [A] Vol 1 A-L | J B Hayward 1990 |
| O'Byrne, William R | Naval Biographical Dictionary [A] Vol 2 M-Z | J B Hayward 1990 |
| O'Callaghan, John | Saga of the SS Great Britain [The] | Granada |
| O'Coineen, Enda | Unsinkable Kilcullen [The] | |
| O'Connell, Geoffrey | Boat Owners Maintenance Book [The] | |
| O'Connell, Geoffrey | Boatbuilding Book [The] | |
| O'Connor, G W | First Hundred Years [The] | |
| O'Connor, V C Scott | Empire Cruise [The] | Second limited to 500 copies |
| O'Donoghue, K J | Hain of St Ives | P/B |
| O'Driscoll, Brendan | On a Wave and a Prayer | P/B |
| O'Mahoney, B M E | Newhaven Dieppe 1825-1980 | P/B |
| O'May, Dave | Song of Steam | 1st |
| O'May, Harry | Wrecks in Tasmanian Waters | |
| O'Neil, Paul | Rivermen [The] | |
| O'Neill, Richard | Suicide Squads | |
| O'Toole, Laurence | Cornish Captains Tale [The] | P/B |
| Oakeley, John | Winning | 2nd Edition 4th Impression |
| Oakland | Oakland Port and Shipping Handbook 1986 | |
| Oakum | Oakum | P/B |
| Ocean Freighters and Tankers | Ocean Freighters and Tankers British Flag [1986] | P/B |
| Ocean Freighters UK | Ocean Freighters UK 1982 | P/B |
| Ocean Liners | Ocean Liners of the Past Empress of Britain | Reprint Patrick Stephens 1971 |
| Ocean Liners | Ocean Liners of the Past Normandie | Patrick Stephens 1972 |
| Ocean Ships | Ocean Ships 1964 | |
| Ocean Ships | Ocean Ships 1966 | Second 1966 |
| Ocean Ships | Ocean Ships 1967 | 3rd 1967 |
| Ocean Ships | Ocean Ships 1971 | 4th 1971 |
| Ocean Ships | Ocean Ships 1974 | 5th 1974 |
| Ocean Ships | Ocean Ships 1978 | 6th 1978 |
| Ocean Ships | Ocean Ships 1982 | Revised 1982 |
| Ocean Ships | Ocean Ships 1986 | Revised 1986 |
| Ocean Ships | Ocean Ships 1994 | Revised 1994 |
| Ocean Ships | Ocean Ships 1996 | New edition 1996 |
| Ocean Ships | Ocean Ships 1996 | Revised 1998 |
| Ocean Ships | Ocean Ships 2000 | Ian Allan 2000 |
| Ocean Ships | Ocean Ships 2004 | Revised 2004 |
| Ocean Ships | Ocean Ships 2006 | 14th 2006 |
| Oceanos | Oceanos Portugal and the Sea | P/B |
| Oceans | Oceans | |
| Odgers, George | Royal Australian Navy [The] | |
| Oehmig, Alfred | Dampfer auf dem Rhein in Alten Ansichten | German |
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