Queenston is a compact rural community and unincorporated place 5 kilometres (3.1 mi) north of Niagara Falls in the Town of Niagara-on-the-Lake, Ontario, Canada. It is bordered by Highway 405 to the south and the Niagara River to the east; its location at the eponymous Queenston Heights on the Niagara Escarpment led to the establishment of the Queenston Quarry in the area. Across the river and the Canada–US border is the village of Lewiston, New York. The Lewiston-Queenston Bridge links the two communities. This village is at the point where the Niagara River began eroding the Niagara Escarpment. During the ensuing 12,000 years the Falls cut an 11 kilometres (6.8 mi) long gorge in the Escarpment southward to its present-day position.

Niagara-on-the-Lake is a town in Ontario, Canada. It is located on the Niagara Peninsula at the point where the Niagara River meets Lake Ontario, across the river from New York, United States. Niagara-on-the-Lake is in the Niagara Region of Ontario and is the only town in Canada that has a lord mayor. It had a population of 19,088 as of the 2021 Canadian census.