| Regimental number | 3438 |
| Place of birth | Beechworth Victoria |
| Religion | Roman Catholic |
| Occupation | Tanner |
| Address | South Melbourne, Victoria |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Father, Denis O'Brien, 93 Moray Street, South Melbourne, Victoria |
| Enlistment date | 7 March 1917 |
| Date of enlistment from Nominal Roll | 5 March 1917 |
| Rank on enlistment | Private |
| Unit name | 46th Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/63/4 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A11 Ascanius on 11 May 1917 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 46th Battalion |
| Fate | Returned to Australia 15 January 1919 |
| Date of death | 8 November 1964 |
| Place of burial | Fawkner Cemetery |
