Gertrud Baer (1890–1981) was a German Jewish women's rights and peace activist. One of the founding members of the Women's International League for Peace and Freedom, she served as the executive secretary of the German branch of WILPF beginning in 1921 and co-chair of the international organization from 1929 to 1947. Throughout World War II, though leadership was shared, Baer was the primary leader of the organization. At the end of the war, she became the first WILPF consultant to the United Nations and held that post until 1972.