Gatty is a surname. Notable people with the surname include:
Alfred Gatty (1813–1903), British Church of England vicar and author
Alfred Scott-Gatty (1847–1918), British officer of arms and composer
Harold Gatty (1903–1957), Australian navigator, inventor, and aviation pioneer
Harsha Raj Gatty (born 1987), Indian activist
Juliana Horatia Ewing (née Gatty) (1841–1885), English writer of children's stories
Luis Gatty Ribeiro (born 1979), Bolivian footballer
Marek Gatty-Kostyal (1886–1965), Polish chemist and pharmaceutical scientist
Margaret Gatty (1809–1873), English writer of children's literature and naturalist
Nicholas Gatty (1874–1946), English composer and music critic