Doris Amelia Blackburn (née Hordern) (18 September 1889 – 12 December 1970) was an Australian political activist and member of parliament.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.