County Route 46 (CR 46) is a major county road in eastern Suffolk County, New York, in the United States. It runs north and south from CR 75 in Smith Point County Park (part of the Fire Island National Seashore) to New York State Route 25A (NY 25A) near the border of Shoreham and Wading River. The road is known as William Floyd Parkway along its entire length, and is named after William Floyd, a Long Island native and a signer of the United States Declaration of Independence. Despite its "parkway" designation, the road is open to commercial vehicles.