Denis Lemieux (born 1963/64) is a Canadian politician, who was elected to represent the riding of Chicoutimi—Le Fjord in the House of Commons of Canada in the Canadian federal election, 2015. Citing family reasons, he announced his resignation on November 6, 2017. It took effect on December 1, 2017. Lemieux holds a bachelor's degree in general engineering and has held a variety of positions in industrial companies in the region.