Frédéric Pelletier (1 May 1870 – 30 May 1944) was a Canadian choir conductor, music educator, composer, music critic, journalist, civil servant, military officer, and physician. He was one of the principal music critics in Montreal during the first half of the 20th century, having worked in that capacity for every major publication in Montreal at one time or another. He was also a professor of music history at several institutions and worked as a choirmaster in several Montreal churches. His compositional output was mainly dedicated to sacred choral works, including several motets and carols, 2 oratorios, a Requiem Mass, and a Stabat Mater. He also wrote some works for solo organ, some songs, and a number of harmonizations of Canadian folk tunes.
Born in Montreal, Pelletier was part of a prominent musical family in Quebec. He was the son of musician Romain-Octave Pelletier I, the brother of organist, composer and conductor Romain Pelletier, and the father of violinist Romain-Octave Pelletier II. His other brother Victor was a cellist in J.-J. Goulet's Montreal Symphony Orchestra of which he also served as music librarian. He began his musical education as a boy studying the piano under his father. He later was a pupil of Guillaume Couture (singing) and Achille Fortier (harmony and counterpoint).
In c. 1887 Pelletier entered the Royal Military College Saint-Jean and after graduating served as a captain in the Les Fusiliers Mont-Royal. He then entered the medical school at the Université de Montréal where he earned his MD in 1895. He operated a medical practice in Montreal for a little while, but abandoned it in favour of a career as a journalist and musician. He worked as a reporter and editor for various daily newspapers in Montreal up until 1914. He also was a music columnist for various periodicals from 1900 up until the end of his life; including La Patrie (1904–1910), La Presse (1904–1910), La Musique (1919–1921), Musical America (1923–1925), Association française d'action artistique (1920–1944), L'Art musical, La Lyre, Musical Canada, and the Quinzaine musicale et artistique among others. For Le Devoir he authored a dozen reviews between 1911 and 1913 before being appointed its long-time music editor and critic (1916–1944).