Mary Dunn may refer to:
Marie Prevost (1896–1937), Canadian-American actress born Mary Bickford Dunn Mary Dunn (writer) (1900–1958), British author who created Lady Blanche Addle Mary Dunn (yoga) (1942–2008), American Iyengar yoga instructor Mary Maples Dunn (1931–2017), American historian Mary Dunn (sports executive) (1903–1965), Canadian sports executive