John Michael William Curphey Forrestall (born September 23 1932) is a Canadian politician.
A Nova Scotia journalist and businessman, Forrestall was first elected to the Canadian House of Commons in the 1965 federal election as the Progressive Conservative Member of Parliament for Halifax, Nova Scotia. He was elected the MP for Halifax East--Dartmouth in 1968 and remained in the House for a total of twenty-three years. During the Brian Mulroney government Forrestall served as a parliamentary secretary to a succession of miniters until he was defeated in the 1988 federal election that saw many Maritime Tory MPs defeated in what was by then the riding of Dartmouth due to the unpopularity of the Canada-US Free Trade Agreement in Atlantic Canada. In November 1990, Prime Minister Mulroney appointed Forrestall to the Canadian Senate where he sat as a Progressive Conserative until February 2004 when he and most of the Tory caucus joined the new Conservative Party of Canada.
Forrestall is scheduled to leave the Upper House on September 23, 2007 when he reaches the mandatory retirement age of 75.