| Regimental number | 136 |
| Place of birth | Toodyay, Western Australia |
| Religion | Church of England |
| Occupation | Grocer |
| Address | Toodyay, Western Australia |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Mother, Mrs Sarah Green, Toodyay, Western Australia |
| Enlistment date | 5 June 1917 |
| Date of enlistment from Nominal Roll | 23 April 1917 |
| Place of enlistment | Northam, Western Australia |
| Rank on enlistment | Private |
| Unit name | 1st Anzac Mounted Division, 1st Machine Gun Squadron, August 1917 Reinforcements |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board SS Canberra on 23/11/17 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 1st Machine Gun Squadron |
| Fate | Returned to Australia 17 July 1919 |
| Family/military connections | Brother: 202 Pte Frederick Cluney O'NEILL, Australian Motor Transport Section, effective abroad (still overseas). |
| Other details | Medals: British War Medal, Victory Medal |