The Cape Cod Canal is an artificial waterway in the U.S. state of Massachusetts connecting Cape Cod Bay in the north to Buzzards Bay in the south, and is part of the Atlantic Intracoastal Waterway. The approximately seven-mile-long (11 km) canal traverses the neck of land joining Cape Cod to the state's mainland. It mostly follows tidal rivers widened to 480 feet (150 m) and deepened to 32 feet (9.8 m) at mean low water, shaving 135 miles (217 km) off the journey around the Cape for its approximately 14,000 annual users.Most of the canal is located in the town of Bourne, but its northeastern terminus is in Sandwich. Scusset Beach State Reservation lies near the canal's north entrance, and the Massachusetts Maritime Academy is near its south. A swift-running current changes direction every six hours and can reach 5.2 miles per hour (8.4 km/h) during the receding ebb tide. The waterway is maintained by the United States Army Corps of Engineers and has no toll fees. It is spanned by the Cape Cod Canal Railroad Bridge, the Bourne Bridge, and the Sagamore Bridge. Traffic lights at either end govern the approach of vessels over 65 feet (20 m).

The canal is occasionally used by whales and dolphins, including endangered North Atlantic right whales; these can cause closure of the canal.