| Regimental number | 55669 |
| Place of birth | Brisbane Queensland |
| Religion | Presbyterian |
| Occupation | Blacksmith |
| Address | Arthur Street, Nundah, Queensland |
| Marital status | Married |
| Age at embarkation | 31 |
| Next of kin | Wife, Mrs C Mackay, Prospect Street, Bowen Hills, Brisbane, Queensland |
| Enlistment date | 17 April 1917 |
| Rank on enlistment | Private |
| Unit name | 7th General (Victorian) Reinforcements |
| AWM Embarkation Roll number | 23/111/3 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A74 Marathon on 23 July 1918 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 7th General Service Reinforcements |
| Fate | Returned to Australia 13 July 1919 |
| Family/military connections | Brother: 1381 Pte Lachlan MACKAY, 1st Pioneer Bn, returned to Australia, 13 February 1917. |