Campbellville is a compact rural community[1] in the geographic township of Nassagaweya in the Town of Milton, Ontario.

[1] It is on the Niagara Escarpment and is a tourist destination for residents of the Greater Toronto Area.

[2] Nassagaweya Township was part of Halton County until 1974, when the Regional Municipality of Halton was created and the township became part of the town of Milton.

[citation needed] Located in Campbellville are Mohawk Racetrack, a harness racing venue; Crawford Lake Conservation Area, Mennonite furniture shops, an ice cream parlour, and Cristello's Village Market.

[citation needed] The Serbian Orthodox Eparchy of Canada has its episcopal headquarters in Campbellville.