Derek Fletcher (born July 26, 1951 in Lichfield , England) is a former politician in Ontario, Canada. He was a New Democratic Party member of the Legislative Assembly of Ontario from 1990 to 1995.

Fletcher worked as a flexographic press operative for sixteen years at Macmillan Bathurst Industries in Guelph, Ontario. He served as president of the Guelph and District Labour Council from 1984 to 1988, and was a school board trustee on the Wellington County Public School Board from 1985 to 1990.

Fletcher first ran for the Ontario legislature in the 1985 provincial election, finishing a distant third in the riding of Wellington South . In the 1987 provincial election, he finished second in the redistributed riding of Guelph . In both cases, the winning candidate was Liberal Rick Ferraro .

The NDP unexpectedly won a majority government in the 1990 provincial election, and Fletcher defeated Ferraro by 3,107 votes in his third run for office. He served as a parliamentary assistant for the next five years, but was never appointed to cabinet. In early 1995, Fletcher announced that the University of Guelph was being given $93,900 from a provincial University Research Incentive Fund.

The NDP were defeated in the 1995 provincial election, and Fletcher finished third in his bid for re-election. The winning candidate was Brenda Elliott of the Progressive Conservatives.

Fletcher's wife is Peggy Brooks, an educational supervisor with Hansard services at the Legislative Assembly of Ontario.