| Regimental number | 627 |
| Place of birth | Wasleys, South Australia |
| Religion | Roman Catholic |
| Occupation | Carpenter |
| Marital status | Single |
| Age at embarkation | 23.9 |
| Height | 5' 6" |
| Weight | 140 lbs |
| Next of kin | Father, Edward O'Reilly, Terowie, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Melbourne, Victoria |
| Rank on enlistment | Private |
| Unit name | 23rd Battalion, C Company |
| AWM Embarkation Roll number | 23/40/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A14 Euripides on |
| Rank from Nominal Roll | 2nd Lieutenant |
| Unit from Nominal Roll | 23rd Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt, Gallipoli, Western Front Commenced return to Australia on board HT 'Marathon', 6 November 1918; disembarked Melbourne, 1 January 1919; appointment terminated (discharged), Adelaide, 30 May 1919. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Date of death | |
| Age at death | 52 |
| Place of burial | AIF Cemetery, West Terrace, Adelaide, South Australia |
| Sources | NAA: B2455, O'REILLY Eugene Jospeh |