Marie Popelin (16 December 1846 – 5 June 1913) was a Belgian lawyer and early feminist political campaigner. Popelin worked with Isabelle Gatti de Gamond in the development of women's education and, in 1888, became the first Belgian woman to receive a doctorate in law. After her accession to the bar was refused, Popelin went on to have an active career as the leader of Belgian League for Women's Rights. She died in 1913 without ever gaining admission to the bar.