Henri-Raymond Casgrain (December 16, 1831 – February 11, 1904) was a French Canadian Roman Catholic priest, author, publisher, and professor of history.

Born in Rivière-Ouelle, Lower Canada, the son Charles-Eusèbe Casgrain and Eliza Anne Baby, Casgrain studied at College of Sainte-Anne-de-la-Pocatière.

In 1852, he enrolled in the Montreal School of Medicine and Surgery, but became a priest in 1856.

In 1859, he was appointed curate of the parish of La Nativité-de-Notre-Dame at Beauport and was free to devote himself entirely to literary pursuits.

[1] In 1877, he was awarded a doctorate of history from the Universite Laval, where he would remain as professor.