Erieau is an unincorporated community in Ontario, Canada.
It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Erieau had a population of 363 living in 187 of its 318 total private dwellings, a change of -6.7% from its 2016 population of 389.
With a land area of 0.69 km2 (0.27 sq mi), it had a population density of 526.1/km2 (1,362.6/sq mi) in 2021.
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