Dalton James Patrick McGuinty (August 13, 1926 – March 16, 1990) was a Canadian politician from Ontario. A member of the Ontario Liberal Party, he was elected to the Legislative Assembly of Ontario from 1987 to 1990. He represented the riding of Ottawa South. He had 10 children, including Dalton McGuinty who was Premier of Ontario from 2003 to 2013, and David McGuinty who has been a member of the House of Commons of the Parliament of Canada since 2004.