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.
Ministry
{| class="wikitable sortable"
|-
!colspan="2" | Party
! Minister
! Portrait
! Portfolio
|-
| | ||rowspan=10| Liberal
| Alfred Deakin <br>
for Ballaarat <br>
| 100px
|
- Prime Minister (without portfolio)
- Leader of the Liberal Party
|-
| |
| Paddy Glynn <br>
for Angas <br>
| 100px
|
- Attorney-General
|-
| |
| George Fuller <br>
for Illawarra <br>
| 100px
|
- Minister for Home Affairs
|-
| |
| Littleton Groom <br>
for Darling Downs <br>
| 100px
|
- Minister for External Affairs
|-
| |
| Sir Robert Best <br>
Senator for Victoria <br>
| 100px
|
- Minister for Trade and Customs
|-
| |
| Sir John Forrest <br>
for Swan <br>
| 100px
|
- Treasurer
|-
| |
| Joseph Cook <br>
for Parramatta <br>
| 100px
|
- Deputy Leader of the Liberal Party
- Minister for Defence
|-
| |
| Sir John Quick <br>
for Bendigo <br>
| 100px
|
- Postmaster-General
|-
| |
| Edward Millen <br>
Senator for New South Wales <br>
| 100px
|
- Vice-President of the Executive Council
- Leader of the Government in the Senate
|-
| |
| Justin Foxton <br>
for Brisbane <br>
| 100px
|
- Minister without Portfolio
|}