Frontenac Islands is a township located in Frontenac County, Ontario, Canada, that encompasses a number of islands at the beginning of the Saint Lawrence River near the outlet of Lake Ontario, including: Arabella, Bayfield, Black Ant, Garden, Goose, Hickory, Horseshoe, Howe, Wolfe, and Simcoe.

Some of these islands have substantial numbers of homes and cottages, but are generally not populated during the winter months when ice build-up in Lake Ontario and the St. Lawrence River make boat access difficult or impossible.

Only Wolfe Island has a recognizable concentrated settlement: the village of Marysville, with around 400 inhabitants.

The Scotch Settlement was a farming area encompassing approximately 3,000 acres which was settled in the 1820s by Scottish clansmen moving west from Glengarry county.

[citation needed] There are several community groups and organizations in the Frontenac Islands.