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.

The Lewiston–Queenston Bridge, also known as the Queenston–Lewiston Bridge, is an arch bridge that crosses the Niagara River gorge just south of the Niagara Escarpment. The bridge was officially opened on November 1, 1962. It is an international bridge between the United States and Canada. It connects Interstate 190 in the town of Lewiston, New York to Highway 405 in the community of Queenston, Ontario. The Lewiston–Queenston Bridge is architecturally similar to the Rainbow Bridge at nearby Niagara Falls.