General Sir Henry Augustus Smyth KCMG FSA FRGS (25 November 1825 – 19 September 1906) was a senior British Army officer.

Of his sisters, Henrietta married the theologian Baden Powell and Georgiana the anatomist Sir William Henry Flower.

Born on 25 November 1825 in Westminster and educated at Bedford School, Smyth was commissioned as second lieutenant in the Royal Artillery in 1843.

[1] In 1888 Smyth mustered an army of 2,000 troops and left for Zululand to put down a rebellion there.

Smyth died on 18 September 1906 at Stone, Buckinghamshire, and was buried there.