William Armstrong may be any of several notable persons:
William Armstrong (1822-1914), Canadian artist
William Armstrong (1782-1865), US Representative from Virginia
William Armstrong (1795-1847), US mayor of Nashville Tennessee
William B. Armstrong, California state assembly member
William Hepburn Armstrong (1824-1919), US Representative from Pennsylvania
William Lester Armstrong (b. 1937), US Senator from Colorado
William George Armstrong, 1st Baron Armstrong (1810-1900), British industrialist
William Armstrong, Baron Armstrong of Sanderstead (1915-1980), British civil servant
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William George Armstrong, 1st Baron Armstrong (November 26, 1810 – December 27, 1900) was an English industrialist, the effective founder of the Armstrong Whitworth manufacturing empire.
Rifled and throwing a shell-shaped projectile, the Armstrong gun is regarded as marking the birth of modern artillery.
Armstrong resigned his position for the Government, the Elswick Ordnance Company merged with what was by now Sir WG Armstrong Mitchell and Company, and the focus turned to finding overseas orders.