Julia Ward Williams Garnet (July 1, 1811 - January 7, 1870) was an American abolitionist who was active in Massachusetts and New York.
Born free in Charleston, South Carolina, she moved with her family as a child to Boston, Massachusetts, and was educated in the North. A member of the Boston Female Anti-Slavery Society, she attended the Anti-Slavery Convention of American Women in New York in 1837. She married abolitionist Henry Highland Garnet and in 1852 they traveled to Jamaica to work as missionaries, where she headed an industrial school for girls. After the American Civil War, she worked with freedmen in Washington, D.C. to establish their new lives.