Brock's Monument is a 56-metre (185 ft) column atop Queenston Heights in Queenston, Ontario, Canada, dedicated to Major General Sir Isaac Brock, one of Canada's heroes of the War of 1812. Brock, a British Army officer in charge of defending Upper Canada from a United States invasion, and one of his aides-de-camp, Lieutenant-Colonel John Macdonell, are interred at the monument's base on the heights above the battlefield where both fell during the Battle of Queenston Heights. The current monument was constructed between 1853 and 1856, which replaced an earlier Monument to Brock on the battlefield (1824–1840). Parks Canada maintains the monument, the most imposing feature of Queenston Heights National Historic Site. It is the fourth oldest war memorial in Canada.

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.