- The Coalition government was defeated by Labor at the October 1929 House of Representatives election
- In May 1931 the Nationalist party merged with pro-Joseph Lyons Labor defectors to form the United Australia Party.
- UAP Senator Walter Duncan resigned on 1 December 1931 and was replaced by Lang Labor member Patrick Mooney.
- In 1931 2 NSW Senators walked out of the Labor party to join Lang Labor
This is a list of members of the Australian Senate from 1929 to 1932. Half of its members were elected at the 14 November 1925 election and had terms starting on 1 July 1926 and finishing on 30 June 1932; the other half were elected at the 17 November 1928 election and had terms starting on 1 July 1929 and finishing on 30 June 1935. The process for filling casual vacancies was complex. While senators were elected for a six year term, people appointed to a casual vacancy only held office until the earlier of the next election for the House of Representatives or the Senate.
The Government changed during the Senate term as the Coalition of the Nationalist Party led by Prime Minister of Australia Stanley Bruce and the Country Party led by Earle Page lost the confidence of the House of Representatives and called an election for October 1929. The Labor Party, led by James Scullin, won the election with a large majority. This was the first time in which an election for the House of Representatives was held without an election for the Senate. Section 13 of the Constitution requires an election to occur within one year of the expiry of senate terms and the terms of senators elected in 1925 were not due to expire until 1932.
In 1931 five Labor members in the House of Representatives split from the Scullin government in opposition to its economic policies on the Great Depression and joined the Nationalist Party and three conservative independents in the House to form the United Australia Party (UAP). Subsequently some New South Wales members and senators were expelled from the Labor Party for their support of New South Wales Premier Jack Lang's policy of repudiating foreign debt and formed the Australian Labor Party (New South Wales)—known as Lang Labor—and later voted with the UAP to defeat the Scullin government, leading to the 1931 election.
|Senator||Party||State||End term||Years in Office|
|John Barnes||Labor||Victoria||1935||1913–1920, 1923–1935|
|Tom Brennan [a]||UAP||Victoria||1932 [b]||1931–1938|
|William Carroll||Country||Western Australia||1932||1926–1936|
|John Chapman [c]||Nationalist /UAP||South Australia||1932||1926–1931|
|Hal Colebatch||Nationalist /UAP||Western Australia||1935||1929–1933|
|Walter Cooper||Country||Queensland||1932||1928–1932, 1935–1968|
|Charles Cox||Nationalist /UAP||New South Wales||1932||1920–1938|
|Thomas Crawford||Nationalist /UAP||Queensland||1935||1917–1947|
|John Daly||Labor||South Australia||1935||1928–1935|
|John Dooley||Labor||New South Wales||1935||1928–1935|
|Walter Duncan [d]||Nationalist/UAP||New South Wales||1932||1920–1931|
|Jack Duncan-Hughes [c]||UAP||South Australia||1932||1931–38|
|James Dunn||Labor/Lang Labor||New South Wales||1935||1929–1935|
|Harold Elliott [a]||Nationalist||Victoria||1932||1920–1931|
|Harry Foll||Nationalist /UAP||Queensland||1935||1917–1947|
|Hon. Bill Glasgow||Nationalist /UAP||Queensland||1932||1920–1932|
|Charles Grant [e]||UAP||Tasmania||1934 [b]||1925, 1932–1941|
|James Guthrie||Nationalist /UAP||Victoria||1932||1920–1938|
|John Hayes||Nationalist /UAP||Tasmania||1935||1923–1947|
|Herbert Hays||Nationalist /UAP||Tasmania||1935||1923–1947|
|Bert Hoare||Labor||South Australia||1935||1922–1935|
|Bertie Johnston||Country||Western Australia||1935||1929–1942|
|Walter Kingsmill||Nationalist /UAP||Western Australia||1935||1923–1935|
|Harry Kneebone [c]||Labor||South Australia||1931 [b]||1931|
|Harry Lawson||Nationalist /UAP||Victoria||1935||1929–1935|
|Patrick Lynch||Nationalist /UAP||Western Australia||1932||1907–1938|
|Hon. Walter Massy-Greene||Nationalist /UAP||New South Wales||1932||1923–1925, 1926–1938|
|Alexander McLachlan||Nationalist /UAP||South Australia||1932||1926–1944|
|John Millen||Nationalist /UAP||Tasmania||1932||1920–1938|
|Patrick Mooney [d]||Lang Labor||New South Wales||1932 [b]||1931–1932|
|Hon. John Newlands||Nationalist /UAP||South Australia||1932||1913–1932|
|James Ogden [e]||UAP||Tasmania||1935||1923–1932|
|Mick O'Halloran||Labor||South Australia||1935||1928–1935|
|Herbert Payne||Nationalist /UAP||Tasmania||1932||1920–1938|
|Hon. Sir George Pearce [f]||Nationalist /UAP||Western Australia||1932||1901–1938|
|William Plain||Nationalist /UAP||Victoria||1932||1917–1923, 1925–1938|
|Arthur Rae||Labor/Lang Labor||New South Wales||1935||1910–1914, 1929–1935|
|Matthew Reid||Nationalist /UAP||Queensland||1935||1917–1935|
|Burford Sampson||Nationalist /UAP||Tasmania||1932||1925–1938, 1941–1947|
|William Thompson||Nationalist /UAP||Queensland||1932||1922–1932|
- Nationalist Senator Harold Edward Elliott died on 23 March 1931; UAP member Tom Brennan was appointed on 12 May to replace him for the remainder of his term finishing on 30 June 1932.
- Appointed to a casual vacancy and only held office until the earlier of the next election for the House of Representatives or the Senate.
- Labor Senator John Chapman died on 14 March 1931; Labor member Harry Kneebone was appointed on 1 April to replace him until the 19 December 1931 election when he was defeated by UAP candidate Jack Duncan-Hughes for the remainder of his term finishing on 30 June 1932.
- UAP Senator Walter Duncan resigned on 1 December 1931; Lang Labor member Patrick Mooney was appointed on 23 December to replace him for the remainder of his term finishing on 30 June 1932.
- UAP Senator James Ogden died on 5 February 1932; UAP member and former Senator Charles Grant was appointed on 3 March to replace him with his term expiring at the September 1934 election, when he was re-elected for the balance of the term expiring on 30 June 1935 and a six year term expiring on 30 June 1941.
- Father of the Senate
- "The Biographical Dictionary of the Australian Senate 1929". Parliament of Australia. Retrieved 19 March 2017.
- Evans, H. "Filling Casual Vacancies before 1977" (PDF). The Biographical Dictionary of the Australian Senate, Volume 3. Parliament of Australia. Retrieved 24 February 2017.
- Constitution (Cth) s 13 Rotation of senators.