INNISFIL is a town in Ontario, Canada, located on the western shore of Lake Simcoe in Simcoe County, immediately south of Barrie and 80 kilometres (50 mi) north of Toronto. It has historically been a rural area, but due to being geographically sandwiched in between the high-growth areas of Barrie area and York Region has meant greater residential development in Innisfil.

The name Innisfil comes from the Irish Inis Fáil, an ancient mythological name for Ireland.

The history of Innisfil spans a period in excess of 170 years. The Town was hewn from almost unbroken virgin forests which had been home to the Huron Indians, and was first surveyed in 1820. The area encompassed 68,653 acres (278 km²), including the villages of Allandale, Tollendal, Painswick, Minets Point, and Holly at the time.