|Area Land||245.03 km2 (94.61 sq mi)|
|Density||91.7/km2 (238/sq mi)|
|Elevation||82.3 m (270.0 ft)|
East Gwillimbury is a town on the East Holland River in the Regional Municipality of York. It is part of the Greater Toronto Area of southern Ontario, in Canada. It was formed by the amalgamation of the Township of East Gwillimbury with all the previously incorporated villages and hamlets within the township. The main centres in East Gwillimbury are the villages of Holland Landing, Queensville, Sharon, and Mount Albert. The Civic Centre (municipal offices) are located along Leslie Street in Sharon. The northernmost interchange of Highway 404 is at the North edge of East Gwillimbury, just south of Ravenshoe Road. The hamlets of Holt and Brown Hill are also within town limits.
East Gwillimbury takes its name from the family of Elizabeth Simcoe, née Gwillim, wife of Sir John Graves Simcoe, first Lt. Governor of the province.
East Gwillimbury began with the early development of Upper Canada by Lieutenant-Governor John Graves Simcoe in the late 18th century. On his order, Yonge Street was constructed from Lake Ontario to what is now the village of Holland Landing in East Gwillimbury.