| Regimental number | 2942 |
| Place of birth | Greymouth, New Zealand |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | 32 Palmer Street, Fitzroy, Victoria |
| Marital status | Single |
| Age at embarkation | 29 |
| Next of kin | Father, Bernard O'Neill, 32 Palmer Street, Fitzroy, Victoria |
| Enlistment date | 29 September 1916 |
| Date of enlistment from Nominal Roll | 3 October 1916 |
| Place of enlistment | Melbourne, Victoria |
| Rank on enlistment | Private |
| Unit name | 37th Battalion, 6th Reinforcement |
| AWM Embarkation Roll number | 23/54/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A7 Medic on 16 December 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 37th Battalion |
| Fate | Returned to Australia 4 January 1919 |
| Family/military connections | Brother: 1756 Pte George O'NEILL, 46th Bn, returned to Australia, 16 December 1917. |
