Helena Dudley (August 31, 1858 – September 29, 1932) was an American social worker, labor organizer, and pacifist. As director of Denison House in Boston from 1893 to 1912, she was an influential leader in the early settlement movement, and aided thousands of poor and working-class immigrants at a time when government relief programs were lacking. Appalled by the working conditions in local sweatshops, which she learned of through her settlement house neighbors, she became increasingly active in the labor movement. She helped organize the Women's Trade Union League in 1903, and supported the Bread and Roses strike in 1912. After World War I she worked to promote the League of Nations, and for many years she was a leading member of the Women's International League for Peace and Freedom.