Others
- William Thompson (confidence man), American criminal, first "confidence man"
- William Boyce Thompson (1869–1930), American mining engineer, financier, philanthropist, and founder of Newmont Mining
- William Tappan Thompson (1812–1882), American humorist
- William Harvey Thompson, prohibition enforcement agent in the Seattle, Washington
- William C. Thompson (1899–1963), American cinematographer
- William Thompson (bishop) (1885–1975), Anglican bishop of Persia (Iran)
- William Thompson (physician) (1861–1926), physician; Registrar General for Ireland, 1909–1926
- William Thompson (poet), 18th century English poet
- William Fawcett Thompson (1894–1974), character actor
- William Thompson (leveller) (died 1649), leader of the Banbury mutiny of the New Model Army in 1649
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