William Hornby

William Hornby may refer to:


 * William Hornby (governor) (1723–1803), Governor of Bombay, 1771–1784
 * William Henry Hornby (1805–1884), British industrialist, Member of Parliament (MP) for Blackburn 1857–1869
 * Sir William Hornby, 1st Baronet (1841–1928), his son, British MP for Blackburn, 1886–1910
 * William Hornby (Warrington MP), British Member of Parliament for Warrington
 * William Hornby (priest) (1848–1932), Archdeacon of Lancaster, 1870–1895