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The 1925 Australian Senate election was held on 14 November 1925 to elect 22 of the 36 senators in the Australian Senate as part of the 1925 federal election. Each state elected three senators to serve a six-year term beginning on 1 July 1926. Due to casual vacancies, Victoria and Tasmania elected an extra senator, while New South Wales elected two extra senators.
Following the death of Nationalist senator Edward Millen in September 1923, Nationalist Walter Massy-Greene was appointed by the Parliament of New South Wales to fill the casual vacancy. Additionally, after the death of Labor senator Allan McDougall in October 1924, the vacancy was first filled by Jack Power and then by William Gibbs, both Labor members. As a result, New South Wales elected five senators, with the fourth and fifth senators elected sitting the remainder of Millen and McDougall's term ending on 30 June 1929.
Following the death of Labor senator Stephen Barker in June 1924, Labor member Joseph Hannan was appointed by the Parliament of Victoria to fill the casual vacancy. As a result, Victoria elected four senators, with the fourth senator elected sitting the remainder of Barker's term ending on 30 June 1929.
Following the death of Nationalist senator Thomas Bakhap in August 1923, Nationalist John Hayes was appointed by the Parliament of Tasmania to fill the casual vacancy. As a result, Tasmania elected four senators, with the fourth senator elected sitting the remainder of Bakhap's term ending on 30 June 1929.