Léo-Paul Desrosiers (April 11, 1896 – April 20, 1967) was a Quebec writer and journalist well known for his historical novels. He was influenced by the nationalism of Henri Bourassa and Lionel-Adolphe Groulx.
He published his first novel in 1922 called Âmes et Paysages. His best-known work, Les Engagés du Grand Portage published in 1938, was set in the fur trade-years in the early 19th century. As a journalist he mainly wrote for Le Devoir.
He won the Ludger Duvernay award in 1951 and the Lorne Pierce Medal in 1963.