Peterson ministry

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Peterson ministry
20th ministry of Ontario
Premier David Peterson
Date formed	June 26, 1985 (1985-06-26)
Date dissolved	October 1, 1990 (1990-10-01)
People and organisations
Monarch	Elizabeth II
Lieutenant Governor	John Black Aird (1985) Lincoln Alexander (1985-1990)
Premier	David Peterson
Deputy Premier	vacant 1985-1987 Robert Nixon 1987-1990
Member party	Liberal
Status in legislature	Minority (1985-1987) Majority (1987-1990)
Opposition party	PC Party (1985-1987), NDP (1987-1990)
Opposition leader	Frank Miller (1985) Larry Grossman (1985-1987) Bob Rae (1987-1990)
History
Elections	1985, 1987
Legislature term	33rd Parliament of Ontario 34th Parliament of Ontario
Incoming formation	1985 Ontario general election
Outgoing formation	1990 Ontario general election
Predecessor	Miller ministry
Successor	Rae ministry

The Peterson Ministry is the name given to the Executive Council of Ontario under the leadership of David Peterson, the 20th premier and president of the executive council.

The Executive Council (commonly known as the cabinet) was made up of members of the Ontario Liberal Party which held first a minority and then a majority of seats in the Legislative Assembly of Ontario. The cabinet was appointed by the Lieutenant Governor of Ontario on the advice of the premier. Members of the council are styled "the Honourable" only for the duration of their membership, not for life.