William Cary may refer to:
William Cary (MP for Mitchell), represented Mitchell (UK Parliament constituency) William J. Cary (1865–1934), U.S. Representative from Wisconsin William L. Cary (1910–1983), Chairman of the U.S. Securities and Exchange Commission William Dennison Cary (1808–1861), founder and namesake of Cary, Illinois William Cary (instrument maker) (1759–1825), English maker of scientific instruments William Cary (1437–1471), gentry; beheaded after Battle of Tewkesbury W. Sterling Cary (1927–2021), American Christian minister
See also William Carey (disambiguation)