William A. Smith or William Alexander Smith may refer to:

William Alden Smith (1859–1932), U.S. Representative and U.S. Senator from the U.S. state of Michigan William Alexander Smith (politician) (1828–1888), U.S. Representative from the U.S. state of North Carolina Sir William Alexander Smith (Boys' Brigade) (1854–1914), founder of the Boys' Brigade William Alexander Smith (boxer) (1904–1955), South African boxer William Alexander Smith, birth name of T. C. Curtis, UK-based Jamaican singer Amor De Cosmos (William Alexander Smith, 1825–1897), Canadian journalist and politician William Andrew Smith (1802–1870), president of Randolph-Macon College William Armstrong Smith, political researcher whose papers reside in the Richard B. Russell Library for Political Research and Studies William Arthur Smith (1918–1989), American artist William A. Smith (Iowa judge) (1870–1958), justice of the Iowa Supreme Court William A. Smith (Kansas judge) (1888-1968), Associate Justice of the Kansas Supreme Court

See also William Smith (disambiguation)