Ethel Marion Smith (1877–1951) was an American women’s rights activist and a union activist in the early 1920s. She participated in women’s organizations such as the National American Woman Suffrage Association (NWSA) and the Women's Trade Union League (WTUL). She also worked with other union organizations such as the National Federation of Federal Employees (NFFE) and the American Federation of Labor (AFL). Ethel Smith spent her life promoting the idea of equal compensation for equal work regardless of gender in order to protect the rights of the individual worker as well as society as a whole.