By ship name
| Ship | Year | Origin | Destination |
| OCEANIC | 1874 | Queenstown | New York |
| OCEANIC | 1874 | Queenstown | New York |
| ODESSA | 1852 | Dublin | New York |
| OHIO | 1845 | Liverpool | New York |
| OHIO | 1888 | Queenstown | New York |
| OLYMPIA | 1873 | Moville | New York |
| ONECO | 1845 | Liverpool | New Orleans |
| ONTARIO | 1832 | Londonderry | Philadelphia |
| OREGON | 1884 | Queenstown | New York |
| ORIENTAL QUEEN | 1849 | Ireland | New Zealand |
| ORLANDO | 1811 | [unspecified] | New York |
| OVANDA | 1847 | Cork | Boston |