Mary Margaret Truman-Daniel, widely known throughout her life as "Margaret Truman", (February 17, 1924 — January 29, 2008) was an American singer who later became a successful writer. She was the only child of Harry S. Truman (33rd President of the United States) and his wife Bess.
She wrote several non-fiction and fiction books. Harry S. Truman (1972) was a critically acclaimed, full length biography of her father drawn from extensive resources at the Truman Library, published shortly before his death. Bess W. Truman (1986) was a detailed personal biography of her mother. She also wrote books on White House first ladies and pets, the history of the White House and its inhabitants, along with a critically successful series of fictional murder mysteries set in various locations in and around Washington, D.C. She continued to write and publish regularly into her eighties.
Margaret Truman-Daniel died in Chicago at the age of 83 on January 29, 2008, following a brief illness during which she was on a respirator and living in an assisted care facility.