| Regimental number | 1949 |
| Place of birth | Goulburn New South Wales |
| Religion | Presbyterian |
| Occupation | Draper |
| Address | c/o Messrs. W Lequsne and Co., Trangie, New South Wales |
| Marital status | Single |
| Age at embarkation | 41 |
| Next of kin | Brother, Stephen Henry Mawson, Millers Avenue, Ashfield, Sydney, New South Wales |
| Enlistment date | 28 December 1915 |
| Rank on enlistment | Private |
| Unit name | 54th Battalion, 3rd Reinforcement |
| AWM Embarkation Roll number | 23/71/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A37 Barambah on 23 June 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 54th Battalion |
| Fate | Returned to Australia 17 March 1917 |
| Miscellaneous details (Nominal Roll) | *given name two spellings Harrold and Harold |
