John James "Jack" Harris KC (born October 27, 1948) is a former Canadian lawyer and politician from Newfoundland and Labrador. Harris served as the New Democratic Party (NDP) Member of Parliament for St. John's East. He represented the riding from 1987 to 1988 and again from 2008 to 2015, when he was defeated. He won the seat again in the 2019 federal election, becoming the only NDP member of the House of Commons from Atlantic Canada. He retired from politics in 2021. Harris is also the former leader of the Newfoundland and Labrador New Democratic Party (1992-2006).