A commissioned vessel of the United States Coast Guard, typically over 65 feet in length, employed for missions including maritime law enforcement, search and rescue, port security, and environmental protection.

Any ship in the USCG fleet designated as a 'cutter,' distinguishing it from smaller boats or patrol craft, often equipped for multi-role operations in coastal and open-ocean environments.

Historically, a term originating from the Age of Sail for fast, maneuverable vessels used to 'cut' through water; modern USCG cutters range from legendary icebreakers to high-speed national security vessels.