Others
- William Armstrong (Christie's Will) (1565–1649), Scottish border freebooter, known as "Christie's Will"
- William Armstrong, 1st Baron Armstrong (1810–1900), British industrialist
- Duff Armstrong (William Armstrong, c. 1833–1899), 1858 defendant for the murder of James Preston Metzker in Mason County, Illinois
- William H. Armstrong (author) (1911–1999), author of the children's book Sounder
- William Nevins Armstrong (1835–1905), attorney general of Hawaii
- William Armstrong (pilot) (1924–1945), member of the Tuskegee Airmen
- William T. Armstrong (1929–2005), Canadian Broadcasting Corporation executive
- William Ward Armstrong, Canadian mathematician and computer scientist
- William Park Armstrong (1874–1944), theologian and New Testament scholar
- William Armstrong (theatre director) (1882–1952), British actor, theatre manager and director
- Billy Armstrong (actor) (1891–1924), British actor
- Billy Armstrong, alias of comics character Jeremy Karne
- William Charles Gordon Armstrong (1865–1951), pioneer in the early history of Calgary, Alberta, Canada
This disambiguation page lists articles about people with the same name.
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