The Canal du Loing is a 49.4 km long canal which connects the Seine (at Saint-Mammès) to the Briare Canal (near Montargis), in France. It runs through the Loiret and Seine-et-Marne departments.
Philippe II, Duke of Orléans sought letters patent to build the canal in 1720, and it was completed in 1723. 3815 barges passed through in 1752 alone. Lock 20 is disused today, leaving 19 locks.
The canal is lateral to the River Loing except in two places where the river is used as part of the canal. There is a total fall of about 37m.
The Canal du Loing is part of the Bourbonnais route from Saint-Mammès on the Seine to Chalon-sur-Saône on the Saône River.