Concordia University (French: Université Concordia) is a public English-language research university located in Montreal, Quebec, Canada. Founded in 1974 following the merger of Loyola College and Sir George Williams University, Concordia is one of the three universities in Quebec where English is the primary language of instruction (the others being McGill and Bishop's). As of the 2022–23 academic year, there were 49,898 students enrolled in credit and non-credit courses at Concordia, making the university among the largest in Canada by enrollment. The university has two campuses, set approximately seven kilometres (four miles) apart: Sir George Williams Campus is the main campus, located in the Quartier Concordia neighbourhood of Downtown Montreal in the borough of Ville Marie; and Loyola Campus in the residential district of Notre-Dame-de-Grâce. With four faculties, a school of graduate studies and numerous colleges, centres and institutes, Concordia offers over 400 undergraduate and over 120 graduate programs and courses.

Concordia is a non-sectarian and coeducational institution, with more than 254,000 alumni. The university is a member of the Association of Universities and Colleges of Canada, International Association of Universities, Canadian Association of Research Libraries, Canadian University Society for Intercollegiate Debate, Canadian Bureau for International Education and Canadian University Press. The university's varsity teams, known as the Stingers, compete in the Quebec Student Sport Federation of U Sports.