Saint-Louis-de-Gonzague (French pronunciation: [sɛ̃ lwi də ɡɔ̃zaɡ]) is a municipality in the Les Etchemins Regional County Municipality in the Chaudière-Appalaches region of Quebec, Canada.

It seems that settlers would have liked to name their parish Saint-Louis, but it was refused due to possible confusion with Saint-Louis-de-Kamouraska (now part of Kamouraska, Quebec).

Monsignor Elzéar-Alexandre Taschereau then suggested to name it Saint-Louis-de-Gonzague, following saint Aloysius Gonzaga.

Another version would be that Cardinal Louis-Nazaire Bégin would have wanted to honour his patron saint, Aloysius Gonzaga.

Lastly, it could also have been to honour Louis-Philippe Pelletier, member of the Legislative Assembly of Quebec for Dorchester.