Dwight Duncan (born 3 January 1959) is a former politician in Ontario, Canada. He was a Liberal member of the Legislative Assembly of Ontario from 1995 to 2013 who represented ridings of Windsor—Walkerville, Windsor—St. Clair and Windsor—Tecumseh. He was a senior member in the government of Dalton McGuinty who served in several cabinet roles including Deputy Premier and Minister of Finance.