Sugar Island is part of Grosse Ile Township, Wayne County, Michigan, United States, and lies about 0.5 miles (0.80 km) west of the border with Canada.

The majority of the island is wooded and it is known for its white sandy beaches and easy access by boat.

In the early part of the 20th century (c. 1900-1940), Sugar Island was the site of a resort park and large dance pavilion.

Tashmoo met her fate on the night of June 18, 1936 while departing Sugar Island she struck a rock.

There were objections to this plan, mainly by environmental groups, as the island is a resting point for many species of migratory birds.