The Second Collier Ministry was the 18th Ministry of the Government of Western Australia and was led by Labor Premier Philip Collier. It succeeded the Second Mitchell Ministry on 24 April 1933, following the defeat of the Nationalist government at the 1933 election on 8 April.
The ministry was followed by the Willcock Ministry on 27 August 1936, a week after Collier resigned as Premier on the grounds of ill health and handed over to the Deputy Premier, John Willcock.
The following ministers served until the reconstitution of the ministry on 26 March 1935:
| Office | Minister | |
|---|---|---|
| Premier Colonial Treasurer Minister for Forests | Philip Collier, MLA | |
| Deputy Premier Minister for Public Works Minister for Labour Minister for Water Supplies | Alick McCallum, MLA (until 16 March 1935) | |
| Minister for Justice Minister for Railways Minister for Education (until 26 March 1935) | John Willcock, MLA | |
| Chief Secretary | John Drew, MLC | |
| Minister for Mines Minister for Health | Selby Munsie, MLA | |
| Minister for Lands Minister for Immigration | Michael Troy, MLA | |
| Minister for Agriculture Minister for Police Minister for the North-West | Harry Millington, MLA | |
| Minister for Employment Industrial Development | James Kenneally, MLA | |
| Minister without portfolio | William Kitson, MLC |
On 16 March 1935, Deputy Premier Alick McCallum resigned from the Ministry and from Parliament. On 26 March, Frank Wise filled the vacancy in the Executive Council whilst a reshuffle took place amongst some of the lower-order ministers.
| Office | Minister | |
|---|---|---|
| Premier Colonial Treasurer Minister for Forests | Philip Collier, MLA (until 19 August 1936) | |
| Deputy Premier Minister for Justice Minister for Railways | John Willcock, MLA | |
| Chief Secretary | John Drew, MLC | |
| Minister for Mines Minister for Health | Selby Munsie, MLA | |
| Minister for Lands Minister for Immigration | Michael Troy, MLA | |
| Minister for Public Works (from 13 May 1936) Minister for Water Supplies Minister for Education (until 13 May 1936) Minister for Police (until 13 May 1936) | Harry Millington, MLA | |
| Minister for Employment Minister for Public Works Minister for Labour | James Kenneally, MLA (until 13 May 1936) | |
| Minister for Agriculture Minister for the North-West (until 13 May 1936) Minister for Education (from 13 May 1936) Minister for Police (from 13 May 1936) | Frank Wise, MLA | |
| Minister for Employment Minister for Labour | Bert Hawke, MLA (from 13 May 1936) | |
| Minister without portfolio | William Kitson, MLC |
At the state elections on 15 February 1936, James Kenneally lost his East Perth seat to an Independent Labor candidate, Thomas Hughes. Kenneally and another candidate contested the poll citing Hughes's status as an undischarged bankrupt at the time of the poll (meaning that he was not eligible to stand), and a fresh by-election was called for 9 May, which Hughes won. On 13 May, Kenneally resigned from the Collier Ministry. Bert Hawke replaced him in the Executive Council and in two of his portfolios, whilst Millington and Wise reshuffled portfolios, in part to unite Works and Water Supplies under one minister.
Willcock assumed all of Collier's portfolios from 20 August 1936 until 27 August 1936 whilst Caucus selected a new Cabinet.