| Regimental number | 371 |
| Place of birth | Wattagan New South Wales |
| Religion | Church of England |
| Occupation | School teacher |
| Address | Wattagan, via Wollombi, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, J Diplock, Wattagan, ViaWollombi, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 1st Battalion, C Company |
| AWM Embarkation Roll number | 23/18/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board Transport A19 Afric on |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 1st Infantry Brigade |
| Fate | Died of wounds |
| Miscellaneous details (Nominal Roll) | *Spelt William Alexander Diplock on NR |
| Age at death from cemetery records | 24 |
| Place of burial | Mont Huon Military Cemetery, Le Treport (Plot IV, Row N, Grave No. 12B), France |
| Panel number, Roll of Honour, Australian War Memorial | 19 |
| Miscellaneous information from cemetery records | Parents: John and Sarah DIPLOCK, Woollombi, New South Wales |