Margaret Heckler, American journalist, lawyer, and politician, 15th United States Secretary of Health and Human Services (died 2018)

Margaret Mary Heckler was an American politician and diplomat who represented Massachusetts's 10th congressional district in the United States House of Representatives from 1967 until 1983. A member of the Republican Party, she also served as the 15th United States Secretary of Health and Human Services from 1983 to 1985, as well as United States ambassador to Ireland from 1986 to 1989.

The United States secretary of health and human services is the head of the United States Department of Health and Human Services, and serves as the principal advisor to the president of the United States on all health matters. The secretary is a member of the United States Cabinet. Robert F. Kennedy Jr. is the incumbent secretary of health and human services, having held the position since February 13, 2025.