The Waterloo County Gaol, located in Kitchener, Ontario, is a retired prison and historic site.

It was designed by the architectural firm Mellish and Russell of Brantford, Ontario who used a Classic Revival style.

For over a century after its completion, the gaol was administered municipally, although this changed after 1968, as the government reformed the administrative system of Ontario's prisons.

The addition of the governor's house in 1878, designed by architect David W. Gingerich, served as the gaolor's residence for the next century of the facility's operation.

After the closing, the building was the subject of a 2002 feasibility study aimed at converting the former prison into an affordable housing project.