Major William Henry Carmichael-Smyth (30 July 1780 – 9 September 1861) was a British military officer in the service of the East India Company.
His father was James Carmichael Smyth, a Scottish physician and he was educated at Charterhouse School.
In 1803 the Second Anglo-Maratha War broke out, and he was present at the battles of Aligarh, Delhi and Laswari.
Thereafter he returned to Bengal and went to Callinger as a field engineer where he was mentioned in dispatches for exemplary valour in 1812.
In 1822 he was appointed Resident Superintendent at East India Company Military Seminary in Addiscombe.