Professor's Lake is a 65-acre (26 ha) spring-fed artificial lake located in Brampton, Ontario, Canada. In 1918, the area where the lake currently exists was a sand and gravel mining site supplying aggregates for construction projects in the northwest area of the Greater Toronto Area. During its lifetime, the site produced approximately 20 million tonnes of aggregate. An aggregate production facility was established in 1954 and continued to operate until 1973 after aggregate deposits were exhausted. The aggregate processing and storage facility remained active for raw materials shipped from other sites for several years afterwards. Upon the site's closure, the land was remediated for future use as a residential area.