Saint-Louis-de-Gonzague-du-Cap-Tourmente () is a parish municipality in Quebec, Canada.
Its population in the 2021 Canadian census was 0. It is a relic of the seigneurial system of New France.
Saint-Louis-de-Gonzague-du-Cap-Tourmente is a small enclave within the municipality of Saint-Joachim, at the foot of Cape Tourmente, and east of Sainte-Anne-de-Beaupré, in the regional county municipality of La Côte-de-Beaupré in the region of Capitale-Nationale.
Located near the provincial capital of Quebec City, it is part of the Communauté métropolitaine de Québec.
Named for Saint Aloysius Gonzaga and Cap Tourmente, a stormy promontory named by Samuel de Champlain, the municipality was set up in 1917 by a law that detached certain buildings and lands belonging to the Séminaire de Québec from the parish of Saint-Joachim in order to avoid paying municipal taxes and fees. At that time, it had an area of several square kilometres, including farmland; however, the law specified that if the Séminaire sold any of its property, it would revert to Saint-Joachim.
By and by, all of the Séminaire's property was sold and was thereby returned to Saint-Joachim, except for the Petit-Cap property, which now constitutes the entire territory of the municipality.
The municipality is not governed by a municipal council but by the Board of Directors of the Séminaire de Québec. As such, it does not have a mayor but rather an administrator.
In the 2021 Census of Population conducted by Statistics Canada, Saint-Louis-de-Gonzague-du-Cap-Tourmente had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.