William Harper

William Harper may refer to:
 * William Harper (South Carolina politician) (1790–1847), US Senator from South Carolina
 * William Rainey Harper (1856–1906), first president of the University of Chicago
 * William Harper (Louisiana politician), state senator (African-American officeholders during and following the Reconstruction era)
 * William Edmund Harper (1878–1940), Canadian astronomer
 * Bill Harper (baseball) (1889–1951), Major League Baseball pitcher
 * Bill Harper (footballer, born 1897) (1897–1989), Scottish football goalkeeper (Hibernian, Arsenal, national team)
 * Billy Harper (footballer, born 1897) (1897–1982), English footballer
 * Billy Harper (footballer, born 1877) (1877–1947), English footballer
 * Bill Harper (footballer, born 1900) (1900–?), Scottish football goalkeeper (Sunderland, Crystal Palace)
 * William Harper (Rhodesian politician) (1916–2006), Royal Air Force pilot and Rhodesian politician
 * Billy Harper (born 1943), American jazz saxophonist
 * William Claude Harper (born 1944), American jewelry artist
 * William Harper (composer) (born 1949), American composer and photographer
 * Bill Harper (soccer) (fl. 1968), Canadian soccer player (national team)
 * Willie Harper (born 1950), former American football linebacker
 * William Jackson Harper (born 1980), American actor
 * William Harper Jr., pioneer aviator with the Wright brothers
 * William Allen Harper, JFK assassination witness
 * William A. Harper (1873–1910), Canadian-born artist
 * Will Harper, a character on Eastenders
 * Bill Harper, a character in Ambassador Bill