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- William Carr CBE (1883–1966), surgeon, rear-admiral, Australian naval officer
- William Carr (biographer) (1862-1925), English biographer and magistrate
- William Carr (rower) (1876-1929), American Olympic rower
- William C. Carr (b.1946) American university athletic administrator
- William Compton Carr (born 1918), former Conservative Party U.K. politician
- William Guy Carr (1895–1959; R.D. Commander R.C.N.) Canadian naval officer & author
- William Louis Carr, American Medal of Honor recipient
- Willie Carr (born 1950), former Scottish football (soccer) player
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