Georgina is a town in south-central Ontario. The northernmost municipality in the Regional Municipality of York, the town is bounded to the north by Lake Simcoe. Although incorporated as a town, it operates as a township in which dispersed communities share a common administrative council. The largest communities are Keswick, Sutton, and Jackson's Point. Smaller communities include Pefferlaw, Port Bolster, Roches Point, Udora, and Willow Beach. The town was formed by the merger of the Village of Sutton, the Township of Georgina, and the Township of North Gwillimbury in 1971 and incorporated in 1986. North Gwillimbury had been part of Georgina but became its own township in 1826. It took its name from the family of Elizabeth Simcoe, née Gwillim.

The Regional Municipality of York, also called York Region, is a regional municipality in Southern Ontario, Canada, between Lake Simcoe and Toronto. The region was established after the passing of then Bill 102, An Act to Establish The Regional Municipality of York, in 1970. It replaced the former York County in 1971, and is part of the Greater Toronto Area and the inner ring of the Golden Horseshoe. The regional government is headquartered in Newmarket.