| Regimental number | 1941 |
| Place of birth | Georgetown, South Australia |
| Religion | Roman Catholic |
| Occupation | Clerk |
| Address | Russell Street, Woodville, South Australia |
| Marital status | Single |
| Age at embarkation | 29 |
| Height | 6' 0.25" |
| Weight | 172 lbs |
| Next of kin | Mother, Mrs A O'Leary, Warnertown, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Melbourne, Victoria |
| Rank on enlistment | Private |
| Unit name | 22nd Battalion, 3rd Reinforcement |
| AWM Embarkation Roll number | 23/39/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A68 Anchises on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 22nd Battalion |
| Fate | Killed in Action |
| Miscellaneous details (Nominal Roll) | Fate incorrectly entered on Nominal Roll as KIA 9/8/18. |
| Place of burial | Berks Cemetery Extension (Plot III, Row A, Grave No 34/5), nr Ieper, Belgium |
| Commemoration details | 97 |
| Family/military connections | Brother: 2089 Pte John Justin O'LEARY, 32nd Bn, killed in action, 13 February 1918; Cousin (1st): 2087 Pte Humphrey O'LEARY, 32nd Bn, killed in action, 20 July 1916. |
| Other details |
War service: Egypt, Gallipoli, Western Front Medals: 1914-15 Star, British War Medal, Victory Medal |
| Sources | NAA: B2455, O'LEARY Emmet |