Margaret Livingston Aldrich, also known as Angel of Puerto Rico (née Chanler; October 31, 1870 – March 19, 1963), was an American philanthropist, poet, nurse, and woman's suffrage advocate and prominent member of the Astor family.

She was primarily known to be the owner of Rokeby in Barrytown, New York which she purchased from her siblings.

Aldrich was born Margaret Livingston Chanler on October 31, 1870 in Manhattan to John Winthrop Chanler, prominent attorney and U.S. Representative from New York, and Margaret Astor Chanler (née Ward), who was an Astor heiress.

She served as a nurse with the American Red Cross during the Spanish–American War and Philippine–American War, travelling to the Philippines, Cuba, and Puerto Rico, where she organized the care and treatment of wounded soldiers, for which she received a gold medal from Congress.

[4] Margaret Aldrich purchased from her siblings the family estate Rokeby in Barrytown, New York, where she started a dairy farm.