Nettie Sanford Chapin (née , Skiff; after first marriage, Sanford; after second marriage, Chapin; pseudonym, E. N. Chapin; March 28, 1830 – August 20, 1901) was a 19th-century American teacher, historian, author, newspaper publisher, suffragist, and activist. Chapin wrote mostly prose. She also wrote on Iowa history, and published several small books herself. While residing at Washington, D.C. for several winters, she wrote concerning society and fashionable Washington circles. In 1875, she began the publication of The Ladies Bureau, the first newspaper published west of Chicago by a woman. Chapin served as chair of the National Committee of the National Equal Rights Party.