Cosson or de Cosson is a surname. Notable people with the surname include:
(1766–1839), French general of the Revolution and Empire, baron of the Empire (1846–1929), British scholar and collector of arms and armour Elizabeth Cosson (born 1958), Australian army officer and public servant Ernest Cosson (1819–1889), French botanist Euretta de Cosson Rathbone (died 2003), British skier George Cosson (1876–1963), American politician from Iowa Steve Cosson (born 1968), American theatre writer and director Victor Cosson (1915–2009), French road cyclist