The Third Deakin ministry (Liberal) was the 7th ministry of the Government of Australia. It was led by the country's 2nd Prime Minister, Alfred Deakin. The Fourth Deakin ministry succeeded the First Fisher ministry, which dissolved on 2 June 1909 after the Protectionist Party and the Anti-Socialist Party merged into the Liberal Party "fusion" and withdrew their support in order to form what became the first majority government in federal Australian history. The ministry was replaced by the Second Fisher ministry on 29 April 1910 following the federal election that took place on 13 April which saw the Labour Party defeat the Liberals.

Joseph Cook, who died in 1947, was the last surviving member of the Third Deakin ministry.

This ministry, which was the last to be led by Deakin, was a mostly conservative one, with more than half of its members having previously been either conservative Protectionists or members of the Anti-Socialist Party. These included George Fuller,Sir William Rooke Creswell and the Foundation of the Australian Navy By Sheila Dwyer, Publisher: Cambridge Scholars Publishing, 2014, P.40 Joseph Cook,The History of Australia The Twentieth Century, 1901-1975, by Russel Ward, Publisher: Heinemann Educational Books, 1978, P.68] John Forrest,Becoming John Curtin and James Scullin Their Early Political Careers and the Making of the Modern Labor Party By Liam Byrne, Publisher: Melbourne University Publishing, 2020 Justin Foxton,Consuming Whiteness Australian Racism and the "white Sugar" Campaign By Stefanie Affeldt, Publisher: LIT Verlag, 2014, P.377 Edward Millen,Biographical Dictionary of the Australian Senate Volume 1 By Ann Millar, Publisher: Melbourne University Publishing, 1996 and Paddy Glynn.Book Review Federation’s Man of Letters – Patrick McMahon Glynn, Reviewed by: Tony Abbott, P.228 – via Australian Catholic Historical Society

Ministry Party Minister Portrait Portfolio  Liberal Alfred Deakin for Ballaarat Prime Minister (without portfolio)In this Ministry, the Prime Minister's formal portfolio title was Prime Minister (without portfolio). In all other ministries it has been simply Prime Minister. See Parliamentary Handbook of the Commonwealth of Australia: Historical information on the Australian Parliament - Ministries and Cabinets - 7. Deakin Ministry. Leader of the Liberal Party  Paddy Glynn for Angas Attorney-General  George Fuller for Illawarra Minister for Home Affairs  Littleton Groom for Darling Downs Minister for External Affairs  Sir Robert Best Senator for Victoria Minister for Trade and Customs  Sir John Forrest for Swan Treasurer  Joseph Cook for Parramatta Deputy Leader of the Liberal Party Minister for Defence  Sir John Quick for Bendigo Postmaster-General  Edward Millen Senator for New South Wales Vice-President of the Executive Council Leader of the Government in the Senate  Justin Foxton for Brisbane Minister without Portfolio

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