Grand Traverse Bay is a bay of Lake Michigan formed by the Leelanau Peninsula in the northwestern Lower Peninsula of Michigan. The bay is 32 miles (51 km) long, 10 miles (16 km) wide, and up to 620 feet (190 m) deep in spots. It is divided into two arms by the Old Mission Peninsula. The entire bay is conterminous with the Grand Traverse Bay Bottomland Preserve. It should not be confused with Grand Traverse Bay of Lake Superior, located on the Keweenaw Peninsula.

Traverse City is situated at the south end of the bay where the Boardman River empties into the west arm. Cherry orchards line the bay region, giving rise to Traverse City's claim to be the Cherry Capital of the World. Several nationally known companies offer cherry-based products made with Northern Michigan tart cherries including Traverse Bay Farms, Cherry Central, Fruit Advantage, American Spoon, Cherry Republic and Old Mission Traders (formerly Cherry Stop).