| Regimental number | 3903 |
| Place of birth | Melbourne Victoria |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | 654 Church Street, South Richmond Melbourne, Victoria |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | Father, John O'Connor, 654 Church Street, South Richmond Melbourne, Victoria |
| Enlistment date | 20 September 1915 |
| Date of enlistment from Nominal Roll | 17 September 1915 |
| Rank on enlistment | Private |
| Unit name | 21st Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/38/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A69 Warilda on 8 February 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 24th Battalion |
| Fate | Returned to Australia 29 May 1919 |
| Miscellaneous details (Nominal Roll) | *Spelt Dominie O'Connor on NR |
| Family/military connections | Brother: 4991 Pte Gerald Augustine O'CONNOR, 60th Bn, killed in action, 19 July 1916. |
