Saint-Pierre-de-la-Rivière-du-Sud (French pronunciation: [sɛ̃ pjɛʁ də la ʁivjɛʁ dy syd]) is a parish municipality in Quebec.

In the 2021 Census of Population conducted by Statistics Canada, Saint-Pierre-de-la-Rivière-du-Sud had a population of 840 living in 370 of its 430 total private dwellings, a change of -7.4% from its 2016 population of 907.

With a land area of 91.05 km2 (35.15 sq mi), it had a population density of 9.2/km2 (23.9/sq mi) in 2021.

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