Marguerite de Witt-Schlumberger (20 January 1853 – 23 October 1924) was a French campaigner for pronatalism, alcoholic abstinence, and feminism. She was the president of the French Union for Women's Suffrage (Union française pour le suffrage des femmes / UFSF) movement. She married into the Schlumberger family and became a powerfully influential matriarch and the mother of several sons who achieved notability in their own right. An activist in international women's rights circles, Witt-Schlumberger was a leading suffragist at the Paris Peace Conference in 1919. For her active involvement and service to the government, she was awarded the Croix of the French Legion of Honour in 1920.