| Name | Shipbuilder | Build Location |
|---|---|---|
| Messaquarie | Unknown | Unknown |
| Mezzagesius | Unknown | Unknown |
| Milan | Unknown | Unknown |
| Miltiades | Unknown | Unknown |
| Mindoora | Unknown | Unknown |
| Mobiel | Unknown | Unknown |
| Mokoia | Unknown | Unknown |
| Monacha | Unknown | Unknown |
| Mongolia | Unknown | Unknown |
| Montmorency (1854) | Unknown | Unknown |
| Montora | Unknown | Unknown |
| Morenzie | Unknown | Unknown |
| Morisford | Unknown | Unknown |
| Morning Star | Unknown | Unknown |
| Morovian | Unknown | Unknown |
| Mount Moringa | Unknown | Unknown |
| Mundi | Unknown | Unknown |
| Murray | Unknown | Unknown |
| Nanalah | Unknown | Unknown |
| Nandram | Unknown | Unknown |
| Narran | Unknown | Unknown |
| Natal | Unknown | Unknown |
| Nebo | Unknown | Unknown |
| SS Neckar | Unknown | Unknown |
| Nera | Unknown | Unknown |
| Nesta | Unknown | Unknown |
| Newcastle | Unknown | Unknown |
| Nikko Maru | Unknown | Unknown |
| Ninevah | Unknown | Unknown |
| Nineveh (1863) | Walter Hood & Co. | Unknown |
| Nira | Unknown | Unknown |
| Norfolk | Unknown | Unknown |
| Norman Black Ball Line | Unknown | Unknown |
| Norsemann | Unknown | Unknown |
| Northern Monarch (1875) | Archibald McMillan & Son, Dumbarton | Unknown |
| North Hampton | Unknown | Unknown |
| Northumberland | Unknown | Unknown |
| Norval | Unknown | Unknown |
| Nova | Unknown | Unknown |
| Nurnberg (1874) | Robert Steele & Co., Greenock Yard No.80 | Cartsburn, Scotland |
| Nutscow | Unknown | Unknown |
| SS Oath Captain McNabb | Unknown | Unknown |
| Ocean | Unknown | Unknown |
| Ocean Chief (1853) | Joshua C. Morton & Charles Morton | Thomaston, Maine, US |
| Oceanien | Unknown | Unknown |
| Ocean Rover | Unknown | Unknown |
| Octona | Unknown | Unknown |
| Ohio | Unknown | Unknown |
| Oladis | Unknown | Unknown |
| SS Oldenburg (1890) | Fairfield Shipbuilding & Eng. Co. Ltd. | Glasgow |