The Great Lakes Group (GLG) is an American full-service marine-related transportation company headquartered in Cleveland, Ohio.

[2] Its founding shareholders included Jeptha H. Wade II, John D. Rockefeller,[2] William G. Mather, and James R. Sinclair.

Frequent labor unrest during World War II resulted in the U.S. government assuming control of the Company in 1945–46.

[4] On July 29, 2011, the Shipyard debuted its new Mobile Vessel Hoist, named "America" after one of the company's original tugboats.

The 770-ton hoist, manufactured by Marine Travelift, is the largest of its kind on the Great Lakes, second-largest in the Western Hemisphere and third-largest in the world.

Vessels must transit the Soo Locks en route to the principal ports of Duluth, Minnesota and Thunder Bay, Ontario and outbound to the sea.