William Hornby

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