Hornblower is a surname. Notable people with the surname include:
Jabez Carter Hornblower (1744–1814), pioneer steam engineerJoseph Hornblower (1696?–1762), steam pioneer who installed Newcomen engines in CornwallJoseph Coerten Hornblower (1777–1864), American lawyer and Chief Justice of the New Jersey Supreme CourtJosiah Hornblower (1729-1809), steam pioneer and American politicianJonathan Hornblower (1753-1815), Cornish engineer and inventorJonathan Hornblower (1717) (1717-1780), steam pioneer, father of Jonathan and Jabez HornblowerRalph Hornblower III (born 1948), American lawyer and operatic tenorSimon Hornblower (born 1949), Professor of Classics at University College LondonWilliam B. Hornblower (1851-1914), New York juristNathanial Hörnblowér, a pseudonym of the musician MCA