Heidelberg Woolwich is an unincorporated community in Ontario, Canada, in the Township of Woolwich, Regional Municipality of Waterloo.
It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Heidelberg Woolwich had a population of 640 living in 227 of its 232 total private dwellings, a change of -3.9% from its 2016 population of 666.
With a land area of 0.55 km2 (0.21 sq mi), it had a population density of 1,163.6/km2 (3,013.8/sq mi) in 2021.
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