Preston is a community in Cambridge, Ontario, Canada. Prior to its amalgamation with the city of Galt, the town of Hespeler and the village of Blair to form the new city in 1973, it was an independent town. It is located near the confluence of the Grand River and Speed River. Downtown Preston is commonly considered to be bounded on the north by the entrance to Riverside Park on King Street, and on the south by the King and Bishop plaza.