Martha May Eliot (April 7, 1891 – February 14, 1978), was a foremost pediatrician and specialist in public health, an assistant director for WHO, and an architect of New Deal and postwar programs for maternal and child health. Her first important research, community studies of rickets in New Haven, Connecticut, and Puerto Rico, explored issues at the heart of social medicine. Together with Edwards A. Park, her research established that public health measures (dietary supplementation with vitamin D) could prevent and reverse the early onset of rickets.
Martha May Eliot was a scion of the Eliot family, an influential American family that is regarded as one of the Boston Brahmins, originating in Boston, whose ancestors became wealthy and held sway over the American education system in the late 19th and early 20th centuries. Her father, Christopher Rhodes Eliot, was a Unitarian minister, and her grandfather, William G. Eliot, was the first chancellor of Washington University in St. Louis. The poet, playwright, critic, and Nobel laureate T.S. Eliot was her first cousin.
During undergraduate study at Bryn Mawr College she met Ethel Collins Dunham, who was to become her life partner. After completing their undergraduate education, the two enrolled together at Johns Hopkins University School of Medicine in 1914.
In 1918, Eliot graduated from medical school at Johns Hopkins University. As early as her second year of medical school, Dr. Eliot hoped to become "some kind of social doctor." She taught at Yale University's department of pediatrics from 1921 to 1935. For most of these years, Dr. Eliot also directed the National Children's Bureau Division of Child and Maternal Health (1924–1934). She later accepted a full-time position at the bureau, becoming bureau chief in 1951. In 1956, she left the bureau to become department chairman of child and maternal health at Harvard School of Public Health.