Alexandrina "Didina" Cantacuzino (née Pallady; also known as Alexandrina Grigore Cantacuzino and (Francized) Alexandrine Cantacuzène; 20 September 1876 – 1944) was a Romanian political activist, philanthropist and diplomat, one of her country's leading feminists in the 1920s and 1930s. A leader of the National Council of Romanian Women and the Association of Romanian Women, she served as Vice President of the International Council of Women, representing the International Alliance of Women, as well as Romania, to the League of Nations. However, her feminist beliefs and international profile clashed with her national conservatism, her support for eugenics, and eventually her conversion to fascism.