This is a list of members of the Australian Senate from 1974 to 1975. The 18 May 1974 election was a double dissolution of both Houses, with all 127 seats in the House of Representatives, and all 60 seats in the Senate up for election. The incumbent Labor Party led by Prime Minister Gough Whitlam defeated the opposition Liberal Party led by Billy Snedden and their Coalition partner the Country Party led by Doug Anthony.

In accordance with section 13 of the Constitution, following a double dissolution of Parliament, the terms for senators commence on 1 July preceding the election – i.e., on 1 July 1973. The first five senators elected in each state were allocated the full six-year terms ending on 30 June 1979 while the other half were allocated three-year terms ending on 30 June 1976. However, in fact, the Senate was dissolved on 11 November 1975 for another double dissolution election on 13 December 1975.

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. It was an established convention that the state parliament choose (or the governor appoint) a replacement from the same political party as their predecessor, however this convention was not always followed. There were two appointments to casual vacancies in this term however neither followed the convention with Labor Senator Lionel Murphy being replaced by Independent Cleaver Bunton and Labor Senator Bertie Milliner being replaced by Albert Field who was expelled as a member of the Labor party for accepting the appointment instead of Labor nomination Mal Colston.

At the May 1974 election, Labor won 29 seats, the Coalition won 29 seats and the balance of power was shared by Liberal Movement Senator Steele Hall and Independent Michael Townley. The President of the Senate votes and if the votes are equal, the motion is defeated. Voting in the Senate. Thus the Labor government needed the support of both cross-bench senators to pass any legislation. The Coalition was increased to 30 seats when Townley joined the Liberal party in February 1975 and thus could effectively block any government legislation or motions, but could not pass any motion on their own. Labor was reduced to 27 seats by the replacement of 2 Labor senators with independents. Field was sworn in on 9 September 1975, however he was given leave from 1 October,A Senator can only be absent for 2 months with the permission of the Senate: Vacancy by absence. not to attend the Senate pending a High Court challenge to his eligibility. As a result, the Coalition had a majority in the Senate and as well as blocking supply, could also pass a motion to defer Supply until an election was called. Thus the casual appointments process contributed to the 1975 Australian constitutional crisis.

The controversial appointments of Senators Bunton and Field prompted the 1977 referendum to amend the Constitution to require a replacement senator to be a member of the same political party.Constitution Alteration (Senate Casual Vacancies) Act 1977 (Cth).

Senator Party State Term ending Years in office   New South Wales 1976 1953–1975   New South Wales 1976 1974–1991   Tasmania 1976 1974–1975   South Australia 1979 1961–1981   Queensland 1979 1971–1983   Victoria 1979 1969–1970, 1971–1978   New South Wales 1975 1975   Victoria 1979 1974–1993   South Australia 1976 1969–1978   New South Wales 1979 1970–1987   South Australia 1979 1961–1981   Western Australia 1976 1974–1990   Western Australia 1976 1974–1987   Victoria 1979 1951–1953, 1962–1978   New South Wales 1979 1965–1978   South Australia 1976 1961, 1962, 1965–1981   Tasmania 1979 1965–1978   Western Australia 1979 1958, 1959–1978   South Australia 1976 1959–1975   Western Australia 1976 1970–1993   Tasmania 1976 1974–1975   Queensland 1975 1975   Queensland 1979 1967–1987   New South Wales 1976 1970–1989   Victoria 1979 1968–1976   Tasmania 1976 1974–1987   Victoria 1976 1970–1987   Liberal Movement South Australia 1979 1974–1977   South Australia 1976 1970–1991   Queensland 1976 1964–1983   South Australia 1979 1967–1981   Queensland 1976 1965–1975   Tasmania 1976 1953–1975   Queensland 1976 1974–1984   Queensland 1979 1967–1981   Queensland 1976 1970–1981   New South Wales 1979 1961–1987   New South Wales 1976 1970–1978   Western Australia 1976 1974–1987   South Australia 1976 1970–1983   Victoria 1976 1974–1981   Queensland 1979 1968–1975   Victoria 1976 1974–1986   New South Wales 1979 1964–1983   New South Wales 1979 1962–1975   Tasmania 1979 1947–1981   Victoria 1976 1966–1975   Victoria 1979 1971–1985   Tasmania 1979 1967–1986   New South Wales 1976 1970, 1974–1985   Queensland 1976 1974–1981   Western Australia 1979 1964–1981   / Tasmania 1976 1970–1987   Western Australia 1976 1974–1993   Victoria 1976 1964–1981   Western Australia 1979 1964–1981   Western Australia 1979 1950–1975   Western Australia 1979 1966, 1967–1987   Queensland 1979 1950–1978   Tasmania 1979 1964–1980   Tasmania 1979 1950–1978   South Australia 1979 1968–1981

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