Mary E. Haggart (1843–1904) was an American suffragist, who was active in the women's suffrage movement in Indiana beginning in the late 1860s.
Throughout her lifetime, she consistently worked with the woman's suffrage and temperance movements and will forever be highly regarded as an advocate for both.
Her father, Samuel S. Rothwell was a Methodist Episcopal minister and was one of the original leading abolitionists in western Pennsylvania.
Mary inherited traits from both her mother and father, and in her early childhood practiced lecturing and writing essays.
The professors of Danville Academy took interest in her lecturing ability, and invited her to deliver an address that she titled "Women's True Culture."
Starting in 1877, Haggart held the position of chairman for the Woman Suffrage Central Committee in Indiana.
Her work expanded to the eighteenth annual meeting of the American Woman Suffrage Association which was held in the House of Representatives at the Capital in Topeka, Kansas.
While she fought on the behalf of women, she based her views around justice and the inherent rights for all members of the human race as citizens of the United States.