Millicent Preston-Stanley (9 September 1883 – 23 June 1955) was an Australian feminist and politician who served as the first female member of the New South Wales Legislative Assembly. In 1925, she became the second woman to enter government in Australia. She was also among the first women in New South Wales to become Justices of the Peace and served as president of the Women Justices Association from 1923 to 1926. Throughout her life, Preston-Stanley advocated for women's rights, health reform, and temperance.