Waterloo, Ontario

Waterloo is a city in the Canadian province of Ontario. It is one of three cities in the Regional Municipality of Waterloo (formerly Waterloo County). Waterloo is situated about 94 km (58 mi) west-southwest of Toronto, but it is not considered to be part of the Greater Toronto Area (GTA). At the time of the 2021 census, the population of Waterloo was 121,436.

Due to the close proximity of the city of Kitchener to Waterloo, the two together are often referred to as "Kitchener–Waterloo", "K-W", or "The Twin Cities". Nearby Cambridge, Ontario is also sometimes grouped in, creating KWC or "Tri-cities". While several unsuccessful attempts to combine the municipalities of Kitchener and Waterloo have been made, the 1973 establishment of the Region of Waterloo lessened motivation to do so, and as a result, Waterloo remains an independent city.