Lower Town (also spelled "Lowertown" is a neighbourhood in Rideau-Vanier Ward in central Ottawa, Ontario, Canada, to the east of downtown. It is the oldest part of the city. It is bounded by Rideau Street to the south, the Ottawa River to the west and north and the Rideau River to the east. It includes the commercial Byward Market area in the south-western part, and is predominantly residential in the north and east.

Ottawa is the capital city of Canada. It is located in the southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Quebec, and forms the core of the Ottawa–Gatineau census metropolitan area (CMA) and the National Capital Region (NCR). As of 2021, Ottawa had a city population of 1,017,449 and a metropolitan population of 1,488,307, making it the fourth-largest city and fourth-largest metropolitan area in Canada.