Saint-Zéphirin-de-Courval (French pronunciation: [sɛ̃ zefiʁɛ̃ də kuʁval]) is a parish municipality located in the Nicolet-Yamaska Regional County Municipality of Quebec.

The population as of the Canada 2011 Census was 737.

In the 2021 Census of Population conducted by Statistics Canada, Saint-Zéphirin-de-Courval had a population of 707 living in 291 of its 310 total private dwellings, a change of 1% from its 2016 population of 700.

With a land area of 71.94 km2 (27.78 sq mi), it had a population density of 9.8/km2 (25.5/sq mi) in 2021.

[5] Population trend:[6] Mother tongue language (2006)[7]