The Women's Social and Political Union (WSPU) was a women-only political movement and leading militant organisation campaigning for women's suffrage in the United Kingdom founded in 1903. Known from 1906 as the suffragettes, its membership and policies were tightly controlled by Emmeline Pankhurst and her daughters Christabel and Sylvia. Sylvia was eventually expelled.

A movement to fight for women's right to vote in the United Kingdom finally succeeded through acts of Parliament in 1918 and 1928. It became a national movement in the Victorian era. Women were not explicitly banned from voting in Great Britain until the Reform Act 1832 and the Municipal Corporations Act 1835. In 1872 the fight for women's suffrage became a national movement with the formation of the National Society for Women's Suffrage and later the more influential National Union of Women's Suffrage Societies (NUWSS). As well as in England, women's suffrage movements in Wales, Scotland and other parts of the United Kingdom gained momentum. The movements shifted sentiments in favour of woman suffrage by 1906. It was at this point that the militant campaign began with the formation of the Women's Social and Political Union (WSPU).