Bolton is an unincorporated town that is the most populous community in the town of Caledon, Ontario, Canada, in the Regional Municipality of Peel. It is located beside the Humber River, approximately 50 kilometres northwest of Toronto. In regional documents, it is referred to as a 'Rural Service Centre'. It has 26,795 residents in 9,158 total dwellings. The downtown area that historically defined the village is in a valley, through which flows the Humber River. The village extends on either side of the valley to the north and south.