Gannett is a surname. Notable people with the surname include:
Abbie M. Gannett (1845–1895), American essayist, poet and philanthropist Alice P. Gannett (1875-1962), American settlement house worker and social reformer Ann Cole Gannett (1916-1997), American politician Barzillai Gannett (1764–1832), American politician Diana Gannett, American classical double bassist and educator Ezra Stiles Gannett (1801–1871), American unitarian minister Frank Gannett (1876–1957), American publisher, founder of Gannett Company Henry Gannett (1846–1914), American geographer Lewis Gannett, American writer Robert T. Gannett (1917–2012), American politician