Eleanor Randolph Wilson McAdoo (16 October 1889 — 5 April 1967) was an American author who wrote about her famous father, Woodrow Wilson. She usually went by the nickname Nellie.
Born in Middletown, Connecticut, she married Wilson's Secretary of the Treasury William Gibbs McAdoo at the White House on May 7, 1914. They had a daughter Ellen Wilson McAdoo (1915-1946) and a second daughter, Mary Faith McAdoo (1920-1988). She divorced McAdoo in 1934.
Because she had written a biography about her father, she served as an informal counselor on the 1944 biopic Wilson. In 1965, she became largely incapacitated after suffering a cerebral hemorrhage. McAdoo died at her home in Montecito, California at 77, and was interred at the Santa Barbara Cemetery, Santa Barbara, California.