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Ethel du Pont Roosevelt Warren (January 30, 1916 – May 25, 1965) was an American heiress and socialite and a member of the prominent du Pont family.
Born in Wilmington, Delaware, she was the daughter of Eugene du Pont, Jr. She was raised at Owl's Nest, the family's estate in Greenville, Delaware.
On June 30, 1937, she married Franklin Delano Roosevelt, Jr., son of President Franklin Delano Roosevelt, Sr. and First Lady Anna Eleanor Roosevelt. They had two sons, Franklin Delano Roosevelt III (b. 1938) and Christopher du Pont Roosevelt (b. 1941). The couple separated and formally divorced in 1949. In 1950 Ethel du Pont Roosevelt remarried to prominent Detroit lawyer, Benjamin S. Warren, Sr.
Ethel du Pont was forty-nine years old when she committed suicide on May 25, 1965. Her family endowed the Harvard Medical School Ethel Dupont-Warren Fellowship Award for research in Psychiatry.