Marion Coates Hansen (née Coates; 3 June 1870 – 2 January 1947) was an English feminist and women's suffrage campaigner, an early member of the militant Women's Social and Political Union (WSPU) and a founder member of the Women's Freedom League (WFL) in 1907. She is generally credited with having influenced George Lansbury, the Labour politician and future party leader, to take up the cause of votes for women when she acted as his agent in the general election campaign of 1906. Lansbury became one of the strongest advocates for the women's cause in the pre-1914 era.