Oakville is a town and lower-tier municipality in Halton Region, Ontario, Canada. It is located on Lake Ontario between Toronto and Hamilton. At its 2021 census population of 213,759, it is Ontario's largest town. Oakville is part of the Greater Toronto Area, one of the most densely populated areas of Canada.

The Regional Municipality of Halton, or Halton Region, is a regional municipality in Ontario, Canada, located in the Golden Horseshoe of Southern Ontario. It comprises the city of Burlington and the towns of Oakville, Milton, and Halton Hills. Policing in the Region is provided by the Halton Regional Police Service. The regional council's headquarters are located in Oakville. Burlington, Oakville, and Milton are largely urban and suburban, while Halton Hills is more rural.