Susan Augusta Pike Sanders (March 25, 1842 – September 8, 1931) was an American teacher, clubwoman, and author, who was prominent in charities and social circles. She served as national president of the Woman's Relief Corps, auxiliary to the Grand Army of the Republic, the largest charitable organization in the world in its day. She has the credit of being the originator of placing a flag in every school house, hers the first school to have a flag in McLean County, Illinois. The legislature changed the plan to putting it on the outside, which law was later repealed.