Henri Gagnon (6 March 1887 – 17 May 1961) was a Canadian composer, organist, and music educator. He spent 51 years playing the organ at the Notre-Dame Basilica-Cathedral of Quebec City where, according to music historian François Brassard, he earned "a prestige similar to that of the famous organists of Europe." He was a much-admired teacher and taught at several institutions, notably succeeding Wilfrid Pelletier as the second director of the Conservatoire de musique du Québec à Québec. As a composer, he produced mainly works for solo organ and piano; although he did write a few choral works and vocal pieces as well. One of his more popular works was Rondel de Thibaut de Champagne which Edward Johnson and Rodolphe Plamondon often performed in their recitals. Two of his works, Mazurka (1907) and Deux Antiennes, were recorded by the CBC Montreal Orchestra.[1]