Gustave Maria Blanche (30 April 1849 – 26 July 1916) was a French-Canadian Roman Catholic priest, Bishop, and Vicar Apostolic of Golfe St-Laurent (now Baie-Comeau).

Born in Josselin, Diocese de Vannes, France, the son of L. Blanche and Marie Hayard, Blanche was called to the Bar in France.

From 1890 to 1899, he was director of the College Church Point, Nova Scotia.

In 1905, he was appointed Titular Bishop of Sicca Veneria and Vicar Apostolic of Golfe St-Laurent.

This article about a Canadian Catholic bishop is a stub.