Arthur William Garnett (1829–1861) was an English military and civil engineer in India from the time of the Second Anglo-Sikh War until just after the Indian Rebellion of 1857.
He was appointed assistant field engineer with the army before the conflict at Mooltan, and wounded while in attendance with Sir John Cheape reconnoitering the breaches, but was able to take charge of the scaling-ladders in the subsequent assault.
He joined the army under Lord Gough, held the fords of the Chenâb during the victory at the Battle of Gujrat, and went forward with Sir Walter Raleigh Gilbert's flying column in pursuit of the Afghans.
Having taken part in the first survey of the Peshawûr valley with Lieutenant James Walker (afterwards surveyor-general of India), he was next engaged on public works at Kohât, where in 1850 the sappers employed under his command in making a road to the Kothul were surprised in their camp by the Afridis.
On his return to India in 1861, shortly after his marriage to Mary Charlotte Barnard of Crewkerne, by whom he had a posthumous daughter, and while temporarily acting as assistant to Colonel Yule, C.B., then secretary to government in the department of public works, he was attacked with pleurisy, and died aged thirty-one, after a few days' illness.