| Regimental number | 3082 |
| Place of birth | Strentlough, Ireland |
| Religion | Roman Catholic |
| Occupation | Draper |
| Address | Brisbane, Queensland |
| Marital status | Married |
| Age at embarkation | 43 |
| Next of kin | Wife, Mrs Mary Gallagher, O'Connell Street, South Brisbane, Queensland |
| Enlistment date | |
| Place of enlistment | Brisbane, Queensland |
| Rank on enlistment | Private |
| Unit name | 25th Battalion, 7th Reinforcement |
| AWM Embarkation Roll number | 23/42/2 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT A50 Itonus on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 47th Battalion |
| Fate | Killed in Action |
| Age at death from cemetery records | 44 |
| Place of burial | Pozieres British Cemetery (Plot IV, Row S, Grave No. 40), Ovillers-La-Boisselle, France |
| Panel number, Roll of Honour, Australian War Memorial | 143 |
| Miscellaneous information from cemetery records | Parents: Bernard and Bridget GALLAGHER. Native of Ireland |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, GALLAGHER John |