| Cabinet Name: | Frost ministry |
| Cabinet Type: | ministry |
| Cabinet Number: | 16th |
| Jurisdiction: | Ontario |
| Flag: | Flag of Ontario.svg |
| Flag Border: | true |
| Government Head Title: | Premier |
| Government Head: | Leslie Frost |
| State Head Title: | Monarch |
| State Head: |
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| Represented By Title: | Lieutenant Governor |
| Represented By: |
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| Political Party: | PC Party |
| Opposition Party: | Liberal, CCF |
| Opposition Leader: |
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| Election: | 1951, 1955, 1959 |
| Legislature Status: |
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| Incoming Formation: | 1949 PC leadership convention |
| Outgoing Formation: | resignation |
| Predecessor: | Kennedy ministry |
| Successor: | Frost ministry |
| Minister | Tenure | ||
|---|---|---|---|
| Start | End | ||
| Premier of Ontario | Leslie Frost[1] | May 4, 1949 | November 8, 1961 |
| Minister of Agriculture | Thomas Laird Kennedy[2] | May 4, 1949 | January 20, 1953 |
| Fletcher Stewart Thomas[3] | January 20, 1953 | August 1, 1956 | |
| Bill Goodfellow[4] | August 1, 1956 | November 8, 1961 | |
| Attorney General | Dana Porter[5] | May 4, 1949 | August 17, 1955 |
| Kelso Roberts[6] | August 17, 1955 | November 8, 1961 | |
| Minister Travel and Publicity | Louis-Pierre Cécile[7] | May 4, 1949 | August 17, 1955 |
| Bryan Lewis Cathcart[8] | August 17, 1955 | November 8, 1961 | |
| Minister of Public Welfare | Bill Goodfellow | May 4, 1949 | August 17, 1955 |
| Louis-Pierre Cécile | August 17, 1955 | November 8, 1961 | |
| Minister of Reform Institutions | George Harrison Dunbar[9] | May 4, 1949 | July 15, 1949 |
| William Ernest Hamilton[10] | July 15, 1949 | November 16, 1950 | |
| John Weir Foote[11] | November 16, 1950 | July 18, 1957 | |
| Matthew Dymond[12] | July 18, 1957 | April 28, 1958 | |
| Ray Connell[13] | April 28, 1958 | December 22, 1958 | |
| George Wardrope[14] | December 22, 1958 | November 8, 1961 | |
| Minister of Education | Dana Porter | May 4, 1949 | October 2, 1951 |
| William James Dunlop[15] | October 2, 1951 | December 17, 1959 | |
| John Robarts[16] | December 17, 1959 | November 8, 1961 | |
| Minister of Energy Resources | Robert Macaulay[17] | May 5, 1959 | November 8, 1961 |
| Leslie Frost | May 4, 1949 | August 17, 1955 | |
| Dana Porter | August 17, 1955 | January 30, 1958 | |
| Leslie Frost | February 3, 1958 | April 28, 1958 | |
| James Allan[18] | April 28, 1958 | November 8, 1961 | |
| Ministry of Highways | George Doucett[19] | May 4, 1949 | January 5, 1955 |
| James Allan | January 5, 1955 | April 28, 1958 | |
| Fred Cass[20] | April 28, 1958 | November 8, 1961 | |
| Minister of Public Works | George Doucett | May 4, 1949 | October 2, 1951 |
| Fletcher Stewart Thomas | October 2, 1951 | January 20, 1953 | |
| William Griesinger[21] | January 20, 1953 | May 6, 1958 | |
| James Allan | May 6, 1958 | December 22, 1958 | |
| Ray Connell | December 22, 1958 | November 8, 1961 | |
| Minister of Health | Russell Temple Kelley[22] | May 4, 1949 | August 8, 1950 |
| Mac Phillips[23] | August 8, 1950 | December 22, 1958 | |
| Matthew Dymond | December 22, 1958 | November 8, 1961 | |
| Minister of Planning and Development | William Griesinger | May 4, 1949 | January 20, 1953 |
| Bill Warrender[24] | January 20, 1953 | August 17, 1955 | |
| William Nickle[25] | August 17, 1955 | November 8, 1961 | |
| Minister of Labour | Charles Daley[26] | May 4, 1949 | November 8, 1961 |
| Minister of Municipal Affairs | George Dunbar | May 4, 1949 | August 17, 1955 |
| Bill Goodfellow | August 17, 1955 | November 1, 1956 | |
| Bill Warrender | November 1, 1956 | November 8, 1961 | |
| Minister of Lands and Forests | Harold Robinson Scott[27] | May 4, 1949 | June 3, 1952 |
| Welland Gemmell[28] | June 3, 1952 | June 18, 1954 | |
| Clare Mapledoram[29] | June 18, 1954 | July 4, 1958 | |
| Wilf Spooner[30] | July 4, 1958 | November 8, 1961 | |
| Minister of Mines | Welland Gemmell | May 4, 1949 | June 3, 1952 |
| Philip Kelly[31] | June 3, 1952 | July 18, 1957 | |
| Wilf Spooner | July 18, 1957 | December 22, 1958 | |
| James Anthony Maloney[32] | December 22, 1958 | October 1, 1961 | |
| Minister of Transport | James Allan | June 26, 1957 | April 28, 1958 |
| Matthew Dymond | April 28, 1958 | December 22, 1958 | |
| John Yaremko[33] | December 22, 1958 | November 21, 1960 | |
| Leslie Rowntree[34] | November 21, 1960 | November 8, 1961 | |
| Ministers Without Portfolios | Bill Warrender | August 17, 1955 | November 1, 1956 |
| Provincial Secretary and Registrar | George Arthur Welsh[35] | May 4, 1949 | January 20, 1955 |
| William Nickle | January 20, 1955 | August 17, 1955 | |
| George Harrison Dunbar | August 17, 1955 | December 22, 1958 | |
| Mac Phillips | December 22, 1958 | May 26, 1960 | |
| John Yaremko | May 26, 1960 | November 8, 1961 | |