William Henry Mackinnon

General Sir (William) Henry Mackinnon GCB KCVO (15 December 1852 – 17 March 1929) was a British Army General during World War I.

Military career
Educated at Harrow School, Henry Mackinnon was commissioned into the Grenadier Guards in 1870. He was appointed Military Secretary to Governor of Malta in 1884 and then Private Secretary to the Governor of Madras in India in 1885-1887. He then became Assistant Adjutant General at Home District in 1893 and Colonel commanding the City of London Imperial Volunteers in 1899.

He served in the Second Boer War in 1900 and then became Director of Auxiliary Forces in 1905 and Director General of the Territorial Force in 1908. He was appointed General Officer Commanding-in-Chief for Western Command in 1910; he retired in 1916.

He lived at Carlisle Place in London.

Family
In 1881 he married Madeleine Frances Hatton and they went on to have one daughter.