Mary Caldwell

Mary Caldwell may refer to:
 * Mary Cardwell Dawson (1894–1962), American musician and teacher
 * Mary Gwendolin Caldwell, Marquise des Monstiers-Mérinville (1863–1909), American philanthropist and socialite
 * Mary Hay (actress) (1901–1957), American dancer, musical comedy- and silent screen actress, playwright, and Ziegfeld girl; born Mary Hay Caldwell
 * Mary Letitia Caldwell (1890–1972), American chemist
 * Mary Tourtel (1874–1948), née Caldwell, British artist and creator of the comic strip Rupert Bear