| Regimental number | 4557 |
| Place of birth | Buckrabanyule Victoria |
| Religion | Church of England |
| Occupation | Contractor |
| Address | Strickland Road, Bendigo, Victoria |
| Marital status | Single |
| Age at embarkation | 24 |
| Next of kin | Father, Mr F L O'Brien, Strickland of Road, Bendigo, Victoria |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 7th Battalion, 14th Reinforcement |
| AWM Embarkation Roll number | 23/24/4 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A32 Themistocles on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 57th Battalion |
| Fate | Returned to Australia |
| Family/military connections | Brother: 4558 Pte John James O'BRIEN, 57th Bn, killed in action, 27 September 1917. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Date of death | |
| Place of burial | Springvale Cemetery |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
