Giants Tomb Island is an island with no permanent residents located in Southern Georgian Bay in Ontario, Canada. It measures approximately 5 kilometres from north to south and 2 kilometres from east to west. Its name comes from its resembalnce to a giant tomb, supposedly that of the giant native deity, Kitchikewana.
It is part of the Awenda Provincial Park close to Penetanguishene and Midland. To the west there are other islands, Christian Island, Hope Island and Beckwith Island. Beausoleil Island, part of the Georgian Bay Islands National Park is only a few kilometres to the east.
Giants Tomb Island is popular for day trips with boaters as there are excellent sandy beaches and safe swimming.