David Joseph McGuinty (born February 25, 1960) is a Canadian lawyer and politician from Ontario, Canada.
He is the Member of Parliament for the riding of Ottawa South and sits in the House of Commons of Canada as a Liberal.
He was first elected in the 2004 federal election and was re-elected in 2006, 2008, 2011 and 2015, the latter with a nearly 3-to-1 margin over the second place Conservative candidate.
McGuinty is the brother of former Ontario Premier Dalton McGuinty and is the son of former Member of Provincial Parliament (MPP) Dalton McGuinty Sr..