Hammonasset may refer to the following in the U.S. state of Connecticut:
Hammonasset, a historic area that is now the towns of Clinton and Killingworth Hammonasset Beach State Park, in the town of Madison, New Haven County Hammonasset Connector, a state highway Hammonasset River, a tributary of Long Island Sound Hammonasset School, in the town of Madison, New Haven County