Marie-Marthe Aldéa Landry, PC CM KC (born December 27, 1945) is a lawyer and business woman in the Canadian province of New Brunswick who has been a civil servant, legal practitioner in the private sector, and a politician and cabinet minister.

Landry is a former chair of the Atlantic Provinces Economic Council and was a member of the Board of Directors of the Bank of Canada from 1995 to 2005 and of the Security Intelligence Review Committee from 2005 to 2008.

She served as Chair of the Vitalité Health Network, the New Brunswick Healthcare Association, and as director of the Canadian Healthcare Association, the Canadian Investors Protection Fund, Norbord Inc., Fraser Papers Ltd., Twin River Papers Ltd., The Shaw Group Ltd., Moosehead Brewery Advisory Board, as well as the Wind Energy Institute of Canada.

She presently sits on the board of directors and advisory boards of several corporations, and national and community organisations, including, The Bragg Group of Companies, The Bennett Group of Companies, Thunder Bay Regional Health Sciences Centre, Populus Global Solutions Ltd., Accreditation Canada and Accreditation Canada International, Desjardins General Insurance Group, the Canadian University of Dubai, the Desjardins Movement and Desjardins Financial Pancanadian Advisory Committee and is Chancellor of Université Sainte-Anne, in Nova Scotia.

She was also recipient, in 2009, of the prix Muriel Fergusson Award created by the Greater Moncton Chamber of Commerce to recognize outstanding women in business and leadership roles.