The Frost Ministry was the combined cabinet (formally the Executive Council of Ontario) that governed Ontario from May 4, 1949, to November 8, 1961. It was led by the 16th Premier of Ontario, Leslie Frost. The ministry was made up of members of the Progressive Conservative Party of Ontario, which commanded a majority of the seats in the Legislative Assembly of Ontario throughout its duration.

The ministry replaced the Kennedy ministry following the 1949 Progressive Conservative Party of Ontario leadership election. The Robarts ministry governed through the second part of the 23rd Parliament of Ontario, the entirety of the 24th and 25th Parliaments of Ontario, and the first part of the 26th Parliament of Ontario.

Frost resigned in 1971 and was succeeded as Premier of Ontario by John Robarts.

List of ministers

Frost ministry by portfolio
PortfolioMinisterTenure
StartEnd
Premier of OntarioLeslie FrostMay 4, 1949November 8, 1961
Minister of AgricultureThomas Laird KennedyMay 4, 1949January 20, 1953
Fletcher Stewart ThomasJanuary 20, 1953August 1, 1956
Bill GoodfellowAugust 1, 1956November 8, 1961
Attorney GeneralDana PorterMay 4, 1949August 17, 1955
Kelso RobertsAugust 17, 1955November 8, 1961
Minister Travel and PublicityLouis-Pierre CécileMay 4, 1949August 17, 1955
Bryan Lewis CathcartAugust 17, 1955November 8, 1961
Minister of Public WelfareBill GoodfellowMay 4, 1949August 17, 1955
Louis-Pierre CécileAugust 17, 1955November 8, 1961
Minister of Reform InstitutionsGeorge Harrison DunbarMay 4, 1949July 15, 1949
William Ernest HamiltonJuly 15, 1949November 16, 1950
John Weir FooteNovember 16, 1950July 18, 1957
Matthew DymondJuly 18, 1957April 28, 1958
Ray ConnellApril 28, 1958December 22, 1958
George WardropeDecember 22, 1958November 8, 1961
Minister of EducationDana PorterMay 4, 1949October 2, 1951
William James DunlopOctober 2, 1951December 17, 1959
John RobartsDecember 17, 1959November 8, 1961
Minister of Energy ResourcesRobert MacaulayMay 5, 1959November 8, 1961
TreasurerLeslie FrostMay 4, 1949August 17, 1955
Dana PorterAugust 17, 1955January 30, 1958
Leslie FrostFebruary 3, 1958April 28, 1958
James AllanApril 28, 1958November 8, 1961
Ministry of HighwaysGeorge DoucettMay 4, 1949January 5, 1955
James AllanJanuary 5, 1955April 28, 1958
Fred CassApril 28, 1958November 8, 1961
Minister of Public WorksGeorge DoucettMay 4, 1949October 2, 1951
Fletcher Stewart ThomasOctober 2, 1951January 20, 1953
William GriesingerJanuary 20, 1953May 6, 1958
James AllanMay 6, 1958December 22, 1958
Ray ConnellDecember 22, 1958November 8, 1961
Minister of HealthRussell Temple KelleyMay 4, 1949August 8, 1950
Mac PhillipsAugust 8, 1950December 22, 1958
Matthew DymondDecember 22, 1958November 8, 1961
Minister of Planning and DevelopmentWilliam GriesingerMay 4, 1949January 20, 1953
Bill WarrenderJanuary 20, 1953August 17, 1955
William NickleAugust 17, 1955November 8, 1961
Minister of LabourCharles DaleyMay 4, 1949November 8, 1961
Minister of Municipal AffairsGeorge DunbarMay 4, 1949August 17, 1955
Bill GoodfellowAugust 17, 1955November 1, 1956
Bill WarrenderNovember 1, 1956November 8, 1961
Minister of Lands and ForestsHarold Robinson ScottMay 4, 1949June 3, 1952
Welland GemmellJune 3, 1952June 18, 1954
Clare MapledoramJune 18, 1954July 4, 1958
Wilf SpoonerJuly 4, 1958November 8, 1961
Minister of MinesWelland GemmellMay 4, 1949June 3, 1952
Philip KellyJune 3, 1952July 18, 1957
Wilf SpoonerJuly 18, 1957December 22, 1958
James Anthony MaloneyDecember 22, 1958October 1, 1961
Minister of TransportJames AllanJune 26, 1957April 28, 1958
Matthew DymondApril 28, 1958December 22, 1958
John YaremkoDecember 22, 1958November 21, 1960
Leslie RowntreeNovember 21, 1960November 8, 1961
Ministers Without PortfoliosBill WarrenderAugust 17, 1955November 1, 1956
Provincial Secretary and RegistrarGeorge Arthur WelshMay 4, 1949January 20, 1955
William NickleJanuary 20, 1955August 17, 1955
George Harrison DunbarAugust 17, 1955December 22, 1958
Mac PhillipsDecember 22, 1958May 26, 1960
John YaremkoMay 26, 1960November 8, 1961

Notes