'''Cossart''' is a surname. Notable people with the surname include:
*Ernest Cossart (1876–1951), English actor *Gabriel Cossart (1615–1674), French historian *Hugh Cossart Baker Jr. (1846–1931), Canadian businessman *Hugh Cossart Baker Sr. (1818–1859), Canadian banker *Linda de Cossart, English surgeon *Pascale Cossart (born 1948), French bacteriologist *Yvonne Cossart (1934–2014), Australian virologist,
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