Erin is a town in Wellington County, approximately 80 kilometres northwest of Toronto, Ontario, Canada. Erin is bordered by the Town of Caledon, Ontario to the east, the Town of Halton Hills to the south, the Township of Guelph/Eramosa to the west and the Township of East Garafraxa to the north. The amalgamated town is composed of the former Villages of Erin and Hillsburgh, both urban centres now, as well as the former Township of Erin.