Omer Létourneau (13 March 1891 – 14 August 1983) was a Québécois pianist, organist, composer and orchestra conductor.
A pupil of Joseph-Arthur Bernier, Létourneau won the Prix d'Europe in 1913. In 1917 he directed the production of L'Accordée de village in the Auditorium de Québec in Quebec City which included performances from singers such as baritone Joseph Fournier de Belleval. His wife was the sister of pianist Clotilde Coulombe. One of his notable students was Edwin Bélanger.