Campbellford is an unincorporated place and former town in Northumberland County, Ontario, Canada, in the township municipality of Trent Hills. It lies approximately midway between Toronto and Ottawa. It is situated on both the Trent-Severn Waterway and the Trans Canada Trail. It can be reached from Highway 401 by exiting at Brighton and going north on County Road 30. It can also be reached from Highway 7 at the Havelock exit going south.