Mary Barrett may refer to: Mary Dyer née Barrett (c. 1611–1660), colonial American Quaker martyr Mary Ellin Barrett (1926–2022), American writer Mary Adrian Barrett (1929–2015), American Catholic religious sister Mary Hall Barrett Adams (1816–1860), née Barrett, American book editor and letter writer Mary Ethel Williams Barrett (1913–1951), artist, art teacher, and the first director of the Wilmington Museum of Art
See also Maria Barrett, American general Mario Barrett a.k.a. Mario (born 1986), American singer Maurie Barrett (1893–1981), Australian rules footballer