St. Felix (population: 250) is a rural municipality in Prince Edward Island, Canada. It is located in Prince County, south of Tignish.
The Tignish River (also known as Harper's Brook) begins in the community and runs to Deblois.
The community's name is derived from Pope Felix I.
In the 2021 Census of Population conducted by Statistics Canada, St. Felix 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.