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| Name | Born | Died | Floruit | ||
| OFFICE OF PUBLIC WORKS | - | - | - | - | - |
| OGLE, C.A. | - | - | 20c2 | - | - |
| OLDHAM, THOMAS * | - | - | 18c1 | ||
| OMER, ROWLAND | - | - | 18c3 | - | - |
| OMER, THOMAS | - | - | 18c3 | - | - |
| OPPENHEIMER, LUDWIG, LTD *# | - | - | 20c1 | 20c2 | 20c3 |
| ORAM, ROBERT * | - | - | 18c3 | - | - |
| ORCHARD, WILLIAM PATTERSON | 1850 | 1920 | 19c4 | 20c1 | - |
| ORLEBAR, CUTHBERT KNIGHTLEY # | 1844 | 1882 | 19c2 | 19c3 | - |
| ORMOND, ROBERT * | - | - | 19c2 | - | - |
| ORMONDE, PATRICK J. | 1856/57 | - | 20c1 | - | - |
| ORMSBY, ARTHUR SYDNEY | 1825 | 1887 | 19c2 | 19c3 | 19c4 |
| ORMSBY, MICHAEL THOMAS MORLEY | 1869 | 1942 | 20c1 | - | - |