Fort York is a historic site of military fortifications and related buildings on the west side of downtown Toronto, Ontario, Canada. The fort was built by the British Army and Canadian militia troops in the late 18th and early 19th centuries, to defend the settlement and the new capital of the Upper Canada region from the threat of a military attack, principally from the newly independent United States. It was designated a National Historic Site of Canada in 1923.
In 1793, Lieutenant Governor John Graves Simcoe authorized a garrison on the present site of Fort York, just west of the mouth of Garrison Creek on the north eastern shore of Lake Ontario. Simcoe recognized Toronto was an ideal site for settlement and defence because of its natural harbour and relative longer distance from the United States. Fort York guards the western (at the time of construction, the only) entrance to the bay. Simcoe had decided to make Toronto (which he renamed York) the capital of Upper Canada, and the government, the first parliament buildings and the town were established one and a half miles east of the fort (near the foot of the present Parliament Street).