| Regimental number | 2090 |
| Place of birth | Wasleys, South Australia |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Terowie, South Australia |
| Marital status | Single |
| Age at embarkation | 22.2 |
| Height | 5' 4.5" |
| Weight | 141 lbs |
| Next of kin | Mother, Mrs Kathleen O'Reilly, Terowie, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 32nd Battalion, 3rd Reinforcement |
| AWM Embarkation Roll number | 23/49/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A28 Miltiades on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 48th Battalion |
| Fate | Killed in Action |
| Age at death from cemetery records | 24 |
| Place of burial | Sunken Road Cemetery (Plot I, Row A, Grave No. 10), Contalmaison, France |
| Panel number, Roll of Honour, Australian War Memorial | 146 |
| Miscellaneous information from cemetery records | Parents: Edward and Catherine O'REILLY. Native of Wasleys, South Australia |
| Family/military connections | Brother: 3296 Pte Terence O'REILLY, 48th Bn, killed in action, 12 October 1917. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, O'REILLY Myles |