Mary Barrett

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