Horace John Mackennal (1875-1949)[1] was an Australian architect.
He was educated at King's School in Fitzroy and the University of Melbourne.
He worked as chief draftsman in the office of the Commonwealth Works Director for Victoria before himself being made director in 1914, following some months acting in the role.
[13] Also in the 1930s, he designed the addition of a second floor to the old High Court of Australia building in Melbourne,[14] and the officers mess of Victoria Barracks, Melbourne.
[15] As Director of the Victorian division, he oversaw numerous projects, including the Mail Exchange Building (1913),[16] the series of Drill Halls designed by George H Hallendal in the 1930s, such the Royal Melbourne Regiment Infantry Company Drill Hall, Victoria Street in the City,[17] the Albert Park Signals Corps Drill Hall, and the Fitzroy Drill Hall,[18] as well as the Repatriation Commission Outpatient Clinic in Melbourne, and the officers mess at RAAF Laverton.