| Place of birth | Sydney New South Wales |
| Religion | Roman Catholic |
| Occupation | Solicitor |
| Address | 73 Wigram Road, Glebe, New South Wales |
| Marital status | Married |
| Age at embarkation | 25 |
| Next of kin | Wife, T O'Neill, 73 Wigram Road, Glebe, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | 2nd Lieutenant |
| Unit name | 1st Battalion, 26th Reinforcement |
| AWM Embarkation Roll number | 23/18/5 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A38 Ulysses on |
| Rank from Nominal Roll | Lieutenant |
| Unit from Nominal Roll | 1st Battalion |
| Fate | Returned to Australia |
| Miscellaneous details (Nominal Roll) | *Stated to be Harold Lyon O'Neill on NR |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
