Saint-Vianney (French pronunciation: [sɛ̃ vjanɛ]) is a municipality in the Canadian province of Quebec, located in La Matapédia Regional Council Municipality.

Its name recalls that of the canton of Langis of which Saint-Vianney is a part, named in honor of Louis-Jacques Langis who was parish priest of L'Isle-Verte and canon in the cathedral of Rimouski.

The municipality was officially founded on August 27, 1926 under the name Saint-Jean-Baptise-Vianney.

The first mayor, Oscar Poulin, was elected on October 20, 1926.

In 1988, Saint-Jean-Baptiste-Vianney changed its name to the current Saint-Vianney.