Bigwin Island is an island in the municipality of Lake of Bays, District Municipality of Muskoka in Central Ontario, Canada. It the largest island on Lake of Bays. There are multiple Indigenous burial grounds on the Island and immediately off shore given graves that were once on the island were flooded when lake levels were changed with damming for the purpose of bringing improvements to the logging and navigation industries. The original owners consented to preserve and protect all the ancient burial sites on the island from desecration and to allow Chief John Bigwin, who was still alive at the time, to be buried there with his ancestors when he died.