Brockville (Canada 2006 Census population 21,957) is a city in the Canadian province of Ontario, located in the Thousand Islands region on the St. Lawrence River in Leeds & Grenville County.

Known as the "City of the 1000 Islands", Brockville is located in Southern Ontario on the north shore of the St. Lawrence River, directly opposite Morristown, New York, about half-way between Cornwall in the east and Kingston in the west, and a little over an hour's drive south of Ottawa. One of the oldest cities founded by ethnic Europeans in Ontario, it is named after the British general Sir Isaac Brock.

Brockville is home to several large industrial manufacturers. 3M operates two factories in Brockville, manufacturing tape and occupational health and safety products. Procter & Gamble operations in the city manufacture dryer sheets and cleaning products, employing 600. Other industries include ceiling fan manufacturer Canarm, pharmaceutical manufacturer Trillium Canada, and the oil-blending plant of Shell Canada. Canadian retailer Giant Tiger has also opened a distribution centre for frozen products in Brockville. Abbott Laboratories has a manufacturing plant in Brockville, making infant formula and adult nutritionals for the domestic and overseas markets. Many area residents are employed at the Invista Canada facility (formerly DuPont Canada Ltd.) located in Maitland, just east of Brockville. Transcom WorldWide (formerly NuComm International) also operates a large call centre employing roughly 200 people.

Brockville is also the main administrative, health-care and commercial center for Leeds-Grenville county. Major public-sector employers include the Upper Canada District School Board, which has its headquarters in Brockville; and the Brockville Mental Health Center, locally referred to as the "psych", short for Psychiatric Hospital. From Wikipedia, the free encyclopedia.