Achille Fortier (23 October 1864 – 19 August 1939) was a Canadian composer and music educator. His compositional output includes a modest amount of choral and chamber works, several songs and motets, and a small amount of symphonic music. A considerable portion of his compositions are religious in nature. Much of his work remains unpublished and some of his music is now lost as it was destroyed by a fire. The Bibliothèque et Archives nationales du Québec holds more than 30 of his original scores in its collection.