| Regimental number | 1158 |
| Other Names | O'BRIEN, B C J |
| Religion | Roman Catholic |
| Occupation | Farmer |
| Address | c/o Mrs. J.E. McMahon, Cordeaux River, Kembla Heights, New South Wales |
| Marital status | Single |
| Age at embarkation | 25 |
| Next of kin | Mrs J E McMahon, Cordeaux River, Kembla Heights, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 3rd Battalion F Company |
| AWM Embarkation Roll number | 23/20/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A14 Euripides on |
| Unit from Nominal Roll | 3rd Battalion |
| Fate | Killed in Action |
| Miscellaneous details (Nominal Roll) | *Spelt Branden Charles O'Brien on NR |
| Date of death | |
| Place of burial | Lone Pine Cemetery (Plot II, Row E, Grave No. 23), Gallipoli, Turkey |
| Panel number, Roll of Honour, Australian War Memorial | 37 |