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 Edmund George Hornby, British Member of Parliament for Warrington
• William Hornby (priest), Archdeacon of Lancaster from 1870 to 1895