Orangeville (2006 population 26,925; UA population 29,110) is a town in south-central Ontario, Canada, and the seat of Dufferin County.

Before European settlers, Orangeville was thought to be a native hunting ground. No permanent settlements have been identified in the area, although minor burial sites have been discovered.

The first patent of land was issued to Ezekiel Robinson, a land surveyor, on August 7, 1820. This was followed by land issued to Alan Robinet in 1822. In 1863, Orangeville was named after Orange Lawrence, a businessman born in Connecticut in 1796 who owned several mills in the village. As a young man, he moved to Canada and settled in Halton County. During Mackenzie’s rebellion in 1837, he was a captain in the militia. Lawrence purchased the land that became Orangeville from Robert Hughson. In 1873, the Act of Incorporation was passed and Orangeville was given town status on January 1, 1874.

The public library, located at Broadway and Mill Street, was completed in 1908. Andrew Carnegie, well-known businessman and philanthropist, provided financial assistance for its construction.