Ella M. S. Marble (née , Smith; after first marriage, Marble; after second marriage, Tandberg; August 10, 1850—1929) was an American physician who worked as a journalist, educator, and activist earlier in her career. From girlhood, she took an active interest in any movement calculated to advance the interests of women. Interested in literary and philanthropic work, Marble served as president of the District of Columbia Federation Womans' Clubs, numbering ten societies and 2,500 members ("Pro Re Noto," "Woman's National Press Association," "Womans' Relief Corps," "20th Century Club of Unitarian Church," Civic Center," "Ladies' Auxiliary Board of Emergency Hospital," "Travel Club," "Sons and Daughters of Maine," "District Womans' Suffrage Association"); president, District Federal; vice-pre