Saint-Isidore (French pronunciation: [sɛ̃t‿izidɔʁ]) is a parish municipality in Roussillon Regional County Municipality in the Montérégie administrative region of Quebec, Canada.

The population as of the Canada 2011 Census was 2,581.

It is the hometown of mixed martial arts champion Georges St-Pierre.

In the 2021 Census of Population conducted by Statistics Canada, Saint-Isidore had a population of 2,769 living in 1,072 of its 1,094 total private dwellings, a change of 6.2% from its 2016 population of 2,608.

This Quebec location article is a stub.