Doris Amelia Blackburn (; 18 September 1889 – 12 December 1970) was an Australian social reformer and politician. She served in the House of Representatives from 1946 to 1949, the second woman after Enid Lyons to do so. Blackburn was a prominent socialist and originally a member of the Labor Party. She was married to Maurice Blackburn, a Labor MP, but he was expelled from the party in 1937 and she resigned from the party in solidarity. Her husband died in 1944, and she was elected to his former seat at the 1946 federal election – the first woman elected to parliament as an independent. However, Blackburn served only a single term before being defeated. She later served as president of the Women's International League for Peace and Freedom. Early life Born in Hawthorn, Melbourne, Victoria to Lebbeus Hordern, estate agent, and his wife Louisa Dewson (née Smith), Doris Hordern became involved in women's rights and peace issues from a young age and served as the campaign secretary of Vida Goldstein, the first woman to stand for election to federal parliament in Australia. She married Maurice Blackburn, a fellow firebrand socialist, in Melbourne on 10 December 1914 and spent their honeymoon organising anti-war and anti-conscription campaigns. Politics While her husband served at different times as an Australian Labor Party (ALP) member of the Victorian and Federal parliaments, Blackburn continued to work on social issues, some of which brought her into conflict with the Labor Party (of which she too was a member) and following Maurice's expulsion from the party in 1937, she resigned from the ALP. Her husband continued to sit in parliament as an independent but lost his seat at the 1943 federal election to the official Labor candidate, and died the following year. Parliament Upset at Labor's treatment of her husband, Blackburn stood as an Independent Labour candidate for her husband's old seat of Bourke at the 1946 election, and by winning it she became only the second woman to be elected to the Australian House of Representatives. In parliament Blackburn, who shared the cross benches with fellow former Labor member Jack Lang, championed similar issues to those of her late husband, gaining nationwide notoriety in 1947 as the only MP to vote against the Atomic Energy Bill. She served as the national President of the Council for Civil Liberties. Following an electoral redistribution, her seat of Bourke